Fill the blank space 4, 5, 12, 15, ...., 45, 108, 135

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03 Oct 2011 sequence

Fill the blank space
4, 5, 12, 15, ...., 45, 108, 135

OPtion

1) 30
2) 35
3) 36
4) 40
5) 45
6) 48
7) 55
8) 58
9) 60
10)none of these

Solution

Two different sequences are included in this sequence
4,12,36,108
5,15,45,135

Correct Option: 3 Best Solution (10)

Balakumaran N.A   12 years AGO

Let take, Jumping Sequence 4,12,...,108,...
Multiples of 3; so,
4*3=12,
12*3=36,
36*3=108,
108....
36 is the answer.

Like? Yes (6) | No (1)  

Dr.Dipin Singh   12 years AGO

Two series are there.
Starting from 4,5
Next numbers are 3 times of 4,5 .. i.e 12,15
Next numbers are 3 times of 12,15...i.e. 36,45
Next numbers are 3 times of 36,45.... 108,135

so blank space number is 36.

Like? Yes (3) | No (1)  

vora chirag   12 years AGO

in odd step 4*3=next odd index value
same for the even step index value
12*3=36

Like? Yes (1) | No   

shubham pratap singh   12 years AGO

4*3=12,5*3=15,12*3=36,15*3=45,.... hence missing term is 36

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Amit Nathani   12 years AGO

4,5,12,15,-,45,108,135
can be broken into two part
4,12,-,108...
5,15,45,135....
4,(4*3),(4*3*3),(4*3*3*3)....
5,(5*3),(5*3*3),(5*3*3*3)....

Like? Yes (2) | No (2)  

sridhar reddy   12 years AGO

if we observe the series
we will get
4/5 = 12/15 = x/45 = 108/135
= (12*3)/(15*3)=x/45
hence
=36/45 = x/45
=x=36

Like? Yes (1) | No (1)  

Gunaseelan   12 years AGO

Series is 4,5,4*3,5*3,12*3,15*3,36*3,45*3.

Like? Yes (2) | No (3)  

susmit   12 years AGO

THERE ARE 2 SEQUENCES.
4,12,36,108.....
5.15,45,135

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arjun   12 years AGO

ACTUALLY IT CONTAINS TWO SERIES..
4,12,36,108....
NEXT NO IS THREE TIMES OF PREVIOUS NO.
SECOND SERIES..
5,15,45,135...
HENCE THE ANSWER IS 36 WHICH IS THREE TIMES OF PREVIOUS NO.

Like? Yes (1) | No (2)  

dharmil   12 years AGO

36.
it contains 2 series.
1st is 4,12,_,108.
2nd is 5,15,45,135.
in each of the series next term is 3 times the previous term.

Like? Yes (1) | No (2)