Question 142

What should come in place of the question mark (?) in the following number series ?
1, 5, 17, 53, 161, 485, ?

Solution

The pattern here followed is : 

1 * 3 + 2 = 5

5 * 3 + 2 = 17

17 * 3 + 2 = 53

53 * 3 + 2 = 161

161 * 3 + 2 = 485

485 * 3 + 2 = 1457


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