Question : Directions: Which of the following numbers will replace the question mark (?) in the given series? 53, 54, 50, 59, 43, ?
Option 1: 68
Option 2: 61
Option 3: 18
Option 4: 58
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Correct Answer: 68
Solution : Given: 53, 54, 50, 59, 43, ?
In the above-given series, add and subtract alternately, the square of consecutive natural numbers to the numbers. 53 + (1) 2 = 53 + 1 = 54 54 – (2) 2 = 54 – 4 = 50 50 + (3) 2 = 50 + 9 = 59 59 – (4) 2 = 59 – 16 = 43 43 + (5) 2 = 43 + 25 = 68
So, the missing number is 68. Hence, the first option is correct.
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