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Question : Directions: In the following question, select the missing number from the given series.
47, 49, 53, 61, 77, ?, 173

Option 1: 103

Option 2: 109

Option 3: 99

Option 4: 111


Team Careers360 2nd Jan, 2024
Answer (1)
Team Careers360 21st Jan, 2024

Correct Answer: 109


Solution : Given:
47, 49, 53, 61, 77, ?, 173

Add consecutive powers of 2 to the previous term to get the next term of the series.
47 + 2 1 = 47 + 2 = 49
49 + 2 2 = 49 + 4 = 53
53 + 2 3 = 53 + 8 = 61
61 + 2 4 = 61 + 16 = 77
77 + 2 5 = 77 + 32 = 109
109 + 2 6 = 109 + 64 = 173

So, the missing term is 109. Hence, the second option is correct.

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