3 2 5 6 7 12 9 ?

M4maths Previous Puzzles

21 Mar 2011 What will be the next number

3 2 5 6 7 12 9 ?

OPtion

1) 15
2) 12
3) 20
4) 11
5) 30
6) 13
7) 42
8) 25
9) 30
10) 24

Solution

1+2 = 3, 1*2 = 2
2+3 = 5 2*3 = 6
4+5 = 9 4*5 = 20

Correct Option: 3 Best Solution (16)

Dr.Dipin Singh   13 years AGO

3 2 5 6 7 12 9 ?

1+2=3
1*2=2
2+3=5
2*3=6
3+4=7
3*4=12
4+5=9
4*5=20 ... option 3

Like? Yes (8) | No (1)  

Gunaseelan   13 years AGO

There are 2 different series.
First: 3 5 7 9
Second:2 (2+4)6 (6+6)12 (12+8)20

Like? Yes (4) | No   

YadeeshKumar   13 years AGO

3+2=5
5+2=7
7+2=9

2+4=6
6+6=12
12+8=20

Like? Yes (5) | No (2)  

Balakumaran N.A   13 years AGO

Here, 3(+2),5,7,9etc and 2(+4),6(+6),12(+8),?.

The ans is 20.

Like? Yes (3) | No   

Saranjit Singh   13 years AGO

sum of 1 and 2=3
product of 1 and 2 is 2.
sum of 3 and 2=5
product of 3 and 2 is 6.
..
sum of 4 and 5=9
product of 4 and 5 is 20.

Like? Yes (2) | No   

Bawa   13 years AGO

Two series are mixed.

sum of pair of numbers and product of pair of numbers.
like 3=1+2 and 2=1*2

Like? Yes (2) | No   

Prerna   13 years AGO

3(1+2), 2(1*2), 5(2+3). 6(2*3), 7 (3+4),12(3*4), 9(4+5), 4*5(20)

Like? Yes (2) | No   

ULAGUNATHAN   13 years AGO

we may consider the even term series
so, the series is 2,6,12,the difference is 2^(n-1)he required term is 4. so the next term is 12+2^3=12+8=20

Like? Yes (3) | No (1)  

sanjeev   13 years AGO

odd term no there is increment of 2
ex 3,5,7,9,11
even term no there is +2 increment in each term
2,increment by 4 then next term is 6.same way 12 then 20
2,6,12,20

Like? Yes (2) | No   

GovindhaRajan   13 years AGO

odd digits =>3,5,7,9... Even digits are =>2, _ , 6 , _ , _ , 12 , _ , _ , _ ,20... :p answer is 20

Like? Yes (2) | No   

Shikha   13 years AGO

4+5=9
4x5=20

Like? Yes (1) | No   

kewal   13 years AGO

SUM AND PRODUCTS OF CONSECUTIVE 2 INTEGERS IN NUMBER SYSTEM.
4*5=20

Like? Yes (1) | No   

Bimal   13 years AGO

4+5=9
4*5=20

Like? Yes (1) | No   

Shekhar Sihi   13 years AGO

there is two series one is 3,5,7,9,...
and another is 2,6,12,..
in the first series there is a difference of 2 between the numbers.
and in the second one there is a difference of 4,6,8,.. so the term is 20(12+8).

Like? Yes (1) | No   

suneelkumar.avvari   13 years AGO

th sq 3 2 5 6 7 12 9 20

Like? Yes (1) | No   

Thirukovela Laxmi Narasimha   13 years AGO

even positions are 4-2,9-3,16-4,25-5....
n^2-n

Like? Yes (1) | No