Find Missing Number In The Series; 9, 19, 40, ?, 170

Look at the give series of numbers and find the logic behind them.


Find Missing Number In The Series;

9, 19, 40, ??, 170

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Answer:

The sequence follows the following order;

next number = x+(x+n)


where x is the number in the series and n is the position

So;

2nd number will be = 9 + 9 + 1 = 19

3rd number = 19 + 19 +2 = 40

So; 4th number is 40 + 40 +3 = 83;

To check the answer;

83 + 83 + 4 = 170

Hence;

answer = 83

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