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
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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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