Question : Directions: Which of the following numbers will replace the question mark (?) in the given series?
87, 168, 217, 242, 251, ?
Option 1: 255
Option 2: 253
Option 3: 252
Option 4: 254
Correct Answer: 252
Solution :
Given:
87, 168, 217, 242, 251, ?
In the above-given series, add squares of consecutive odd numbers in descending order to the numbers.
87 + (9)
2
= 87 + 81 =168;
168 + (7)
2
= 168 + 49 = 217;
217 + (5)
2
= 217 + 25 = 242;
242 + (3)
2
= 242 + 9 = 251;
251 + (1)
2
= 251 + 1 = 252
So, the missing number of the series is 252. Hence, the third option is correct.
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