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Find missing number in the series 9 ,19 ,40 ,? ,170

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Find missing number in the series 9 ,19 ,40 ,? ,170
posted Dec 29, 2014 by Rahul Vaidya

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2 Answers

+2 votes
 
Best answer

Ans : 83

Here is the solution:

i =  1;     (increment it by one for next number)
next_number = (number * 2) + i

(9  * 2) + 1 = 19
(19 * 2) + 2 = 40
(40 * 2) + 3 = 83   ===> (this is the ans)
(83 * 2) + 4 = 170
answer Dec 30, 2014 by Arshad Khan
0 votes

Missing number is 83. Double the number and go on adding 1,2,3 ,4... to get the next number.

answer Aug 23, 2016 by Vilas Joshi
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