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Question : Directions: Select the option that will replace the question mark (?) in the given series.
78, 89, 82, 87, 84, ?

Option 1: 88

Option 2: 86

Option 3: 80

Option 4: 78


Team Careers360 16th Jan, 2024
Answer (1)
Team Careers360 25th Jan, 2024

Correct Answer: 86


Solution : Given:
78, 89, 82, 87, 84, ?

Add and subtract alternately the decreasing order of prime numbers.
78 + 11 = 89; 89 – 7 = 82; 82 + 5 = 87; 87 – 3 = 84; 84 + 2 = 86

So, 86 is the missing number of the series. Hence, the second option is correct.

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