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