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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


Team Careers360 24th Jan, 2024
Answer (1)
Team Careers360 25th Jan, 2024

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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