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
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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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