Latest self Aptitude Question SOLUTION: 4,7,12,21,38,__,__

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(#M40009580) SELF question Complete the series Keep an EYE

4,7,12,21,38,__,__

(12 years ago)

Unsolved Read Solution (5)

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Read Solution (5) :

Vignesh  (12 years ago)

Missing Number = 71, 136

Final Series : 4,7,12,21,38,71,136

@@
4,7,12,21,38.
Difference of series is
3,5,9,17
Again we take difference
2,4,8.

So, series will be 4,7,12,21,38,71,136

Taking difference, we get = 3,5,9,17,33,65

Again taking difference, get = 2,4,8,16,32.

Solved.

Is this solution Helpfull? Yes (5) | No (3)  

krishnamurthy  (12 years ago)

Missing numbers are 71 and 136
The given series is like as
4*1-0=4
4*2-1=7
7*2-2=12
12*2-3=21
21*2-4=38
so
38*2-5=71
71*2-6=136

Is this solution Helpfull? Yes (3) | No (1)  

sairamakrishnathotakura  (12 years ago)

71,136
since the initial difference sequence 3,5,9,17,33,65
again we have 2,4,8,16,32 compute backward we get 71,136

Is this solution Helpfull? Yes | No (1)  

sharad  (12 years ago)

62 bngh,l

Is this solution Helpfull? Yes | No (1)  

Venkatesh  (5 years ago)

4*2=8-1=7
7*2=14-2=12
12*2=24-3=21
21*2=42-4=338
38*2=76-5=71
71*2=142-6=136

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