Select the option that will fill in the blank and complete the given series.
7, 16, 40, 84, _____, 252
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 153
| Understanding |
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Given series: 7, 16, 40, 84, _____, 252 Logic: Applying subtraction to the given series, 16 - 7 = 9 40 - 16 = 24 84 - 40 = 44 Applying subtraction to the differences obtained, 24 - 9 = 15 44 - 24 = 20 This means there is a difference of 5, hence the 3rd step series would be: 15, 20, 25, 30 Therefore, 44 + 25 = 69; 69 + 30 = 99 (This gives the 2nd step series) Now, 84 + 69 = 153; 153 + 99 = 252 Hence, the correct answer is 153 |