Question : Directions: Which of the following numbers will replace the question mark (?) in the given series? 15, 28, 45, ?, 87, 116, 147
Option 1: 64
Option 2: 70
Option 3: 54
Option 4: 72
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Correct Answer: 64
Solution : Given: 15, 28, 45, ?, 87, 116, 147
Add the prime numbers to the previous term to obtain the next term. 15 + 13 = 28; 28 + 17 = 45; 45 + 19 = 64; 64 + 23 = 87; 87 + 29 = 116; 116 + 31 = 147
So, 64 is the missing term in the given series. Hence, the first option is correct.
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