next number of the sequence 12, 20, 30, 42, 56, ..... will be

Dr.Dipin Singh   13 years AGO

3*4=12
4*5=20
5*6=30
6*7=42
7*8=56
8*9=72 ... option 7

Like? Yes (4) | No (1)  

Kunj Bihari   13 years AGO

20-12=8
30-20=10
42-30=12
56-42=14
therefore..
72-56=16

Like? Yes (2) | No   

kiran kumar reddy   13 years AGO

N(N+1) = N^2+N
((8*8)+8=72)
0, 2, 6, 12, 20, 30, 42, 56, 72

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mohan   13 years AGO

this sequence is goes on 8, 10,12,14,16 so 56+16=72

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Balakumaran N.A   13 years AGO

Sequence increasing by 8,10,12,14,16,...etc.

so, 56+16= 72.

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animesh paul   13 years AGO

the sequence is like 3^2+3,4^2+4,5^2+5... so 8^2+8=72

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Shiv Kumar   13 years AGO

The series is increment of 8, 10, 12, 14, 16....
The next number will be 56+16 = 72

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Mayur Somatkar   13 years AGO

Difference Of 8-10-12-14-16

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Madhur   13 years AGO

difference b/w two number isincreasing by two each time

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DEEPAK N K   13 years AGO

12 + 8 = 20
20 + 10 = 30
30 + 12 = 42
42 + 14 = 56
56 + 16 = 72

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lata bajaj   13 years AGO

2x6=12
2x(6+4)10=20
2x(10+5)15=30
2x(15+6)21=42
2x(21+7)28=56
2x(28+8)36=72

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sairam   13 years AGO

simple addition
add 8,10,12,14,16 in the succession

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Sachin   13 years AGO

20-12=8
30-20=10
42-30=12
56-42=14
difference increases by 2 so now the outcome difference will be 14+2=16
answer will be 56+16=72

Like? Yes (1) | No   

Koushik Paul   13 years AGO

The difference of the difference is increasing by +2
The differences are 8,10,12,14 so the next difference will be 16 and the the ans is 56+16=72...
So the right option is 7) 72

Like? Yes (2) | No (1)  

sridhar reddy   13 years AGO

the difference of the sequence
12,20,30,42,56,72
is 8,10,12,14.16
answer is 72

Like? Yes (2) | No (1)  

Navya   13 years AGO

12+8=20
20+10=30
30+12=42
42+14=56
56+16=72

Like? Yes (1) | No   

Asheesh Jain   13 years AGO

first time 8 is added to the first no and then 10 is added to the second no and similarly so on..so 16 is added to 56 so it is 72.

Like? Yes (1) | No   

Shubham   13 years AGO

difference of the terms are in AP.

Like? Yes (1) | No (1)  

Sanjana Patnaik   13 years AGO

The difference of each term in the sequence is
8,10,12,14, and next term differ by 16
Hence, the Answer is 56+16=72

Like? Yes (1) | No (1)  

Abhilash   13 years AGO

sequence is added by even number sequentially with 1st no. added by 8

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jitendra kumar prasad   13 years AGO

first we add 8 to get 10,add 10 to get 20,now onward
+12,+14 to get the next number.Hence add 16 to 56 to get the missing term;

Like? Yes (1) | No (1)  

Honey Goel   13 years AGO

differences are of 8,10,12,14,16

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sivakumar   13 years AGO

12+8=20;
20+10=30;
30+12=42;
42+14=56;
56+16=72;

Like? Yes (1) | No (1)  

GAURAV KUMAR SRIVASTAV   13 years AGO

12
12+8=20
20+10=30
30+12=42
42+14=56
56+16=72

Like? Yes (1) | No (1)  

Swetha.R   13 years AGO

The difference between successive numbers is increases by 2 starting from 8.

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Rakesh kumar   13 years AGO

12=3x4
20=4x5
30=5x6
.
56=7x8

therefore....
8x9=72

Like? Yes (1) | No (1)  

Soumyadip Roy   13 years AGO

12+8=20,20+10=30,30+12=42,42+14=56...so 56+16=72

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visheshkothari   13 years AGO

20-12=8
30-20=10
42-30=12
56-42=14
so 56+16=72

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selva krishnan   13 years AGO

first number add with 8
second number add with 10
so the number is increment by this ways
8,10,12,14,16

Answer is :72

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shiv vaishnav   13 years AGO

12+8=20
20+10=30
30+12=42
42+14=56
56+16=72

Like? Yes (1) | No (1)  

sandhya J   13 years AGO

anawer is 72.

reason:
12,20,30,42,56..

20-12=8
30-20=10
42-30=12
56-42=14

thus sequence is +8,+10,+12,+14,+16......
hence,56+16=72 (answer)

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lavanyadevi   13 years AGO

72... difference between each no is 2.. so the term after 56 will be 56+16=72.

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SAURABH MEHTA   13 years AGO

12+8=20
20+10=30
30+12=42
42+14=56
56+16=72
So, the answer will be 72...

Like? Yes (1) | No (1)  

Subhankar Mondal   13 years AGO

add 8,10,12,14,16......12+8=20,20+10=30.........56+16=72

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kvs   13 years AGO

obtain the difference of the before two numbers and add the present digit with (difference+2), then we will get the answer
OR
12+8=20
20+10=30
30+12=42
42+14=56
56+16=72 is answer

Like? Yes (1) | No (1)  

catrocker   13 years AGO

this is an increasing series frst difference is 8 then 10 and then 12 and then 14 now the next number the differnce is 16

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PREETHI   13 years AGO

12,(12+8=20),(20+10=30),(30+12=42),(42+14=56),(56+16=72)
the following sequence 8,10,12,14,16 is added to each number in given sequence.

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JITU MALVIYA   13 years AGO

between each numbers there is a difference of 2 in increasing order

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chennuri varunkumar   13 years AGO

this is number difference i.e.,
20-12=8
30-20=10
42-30=12
56-42=14
72-56=16
then answer:72

Like? Yes (1) | No (1)  

sandeep potnuru   13 years AGO

12,20,30,42,56,72 will be the answer.
since there is a increase of difference from 8,10,12,14,16 in the above sequence.
so option 7 is correct.

Like? Yes (1) | No (2)