Question : Directions: In the following question a series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.
7, 16, 27, 40, 55, ?
Option 1: 70
Option 2: 72
Option 3: 81
Option 4: 66
Correct Answer: 72
Solution :
Given:
7, 16, 27, 40, 55, ?
Add consecutive odd numbers starting from 9 in each number, to get the next number in the series –
7 + 9 = 16; 16 + 11 = 27; 27 + 13 = 40; 40 + 15 = 55; 55 + 17 = 72
So, the missing number is 72. Hence, the second option is correct.
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