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Question : Directions: Which of the following numbers will replace the question mark (?) in the given series?
7, 9, 15, 45, 105, 235, ?

Option 1: 554

Option 2: 545

Option 3: 445

Option 4: 454


Team Careers360 18th Jan, 2024
Answer (1)
Team Careers360 23rd Jan, 2024

Correct Answer: 445


Solution : Given:
7, 9, 15, 45, 105, 235, ?

The pattern is as follows –
7 + (1) 3 + 1 = 9,
9 + (2) 3 – 2 = 15,
15 + (3) 3 + 3 = 45,
45 + (4) 3 – 4 = 105,
105 + (5) 3 + 5 = 235,
235 + (6) 3 – 6 = 445

So, 445 is the missing number in the series. Hence, the third option is correct.

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