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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The sequence follows the following order;
next number = x+(x+n)
where x is the number in the series and n is the position
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
answer = 83