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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