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Question : Directions: In the following question a series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.
8, 15, 28, 53, ?

Option 1: 106

Option 2: 100

Option 3: 108

Option 4: 102


Team Careers360 1st Jan, 2024
Answer (1)
Team Careers360 6th Jan, 2024

Correct Answer: 102


Solution : Given:
8, 15, 28, 53, ?

Multiply the previous term by 2 and then subtract consecutive natural numbers to get the next term.
(8 × 2) – 1 = 16 – 1 = 15;
(15 × 2) – 2 = 30 – 2 = 28;
(28 × 2) – 3 = 56 – 3 = 53;
(53 × 2) – 4 = 106 – 4 = 102

So, 102 is the missing number in the given series. Hence, the fourth option is correct.

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