Question : Directions: Which of the following numbers will replace the question mark (?) in the given series?
15, ?, 52, 72, 93, 115, 138
Option 1: 40
Option 2: 33
Option 3: 20
Option 4: 28
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Correct Answer: 33
Solution :
Given:
15, ?, 52, 72, 93, 115, 138
Add consecutive natural numbers in increasing order starting from 18, to obtain the required missing number in the series –
15 + 18 = 33; 33 + 19 = 52; 52 + 20 = 72; 72 + 21 = 93; 93 + 22 = 115; 115 + 23 = 138
So, the required missing term is 33. Hence, the second option is correct.
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