Question : Directions: In the following question, select the missing number of the given series.
40, 43, 52, 79, 160, ?
Option 1: 415
Option 2: 410
Option 3: 403
Option 4: 413
Correct Answer: 403
Solution :
Given:
40, 43, 52, 79, 160, ?
Add thrice the difference of the previous number, to get the next number –
40 + 3 = 43;
43 + (3 × 3) = 43 + 9 = 52;
52 + (9 × 3) = 52 + 27 = 79;
79 + (27 × 3) = 79 + 81 = 160;
160 + (81 × 3) = 160 + 243 = 403
So, 403 is the missing number. Hence, the third option is correct.
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