What value will come in place of question mark (?) in the number - series given below ?

4, 30, ?, 1440, 7195, 71940

A) 145	B) 545
C) 650	D) 999

Answer: A) 145

Explanation:

4 30 ? 1440 7195 71940

Here the given series follows a pattern of

4 x 10 - 10 = 30

30 x 5 - 5 = 145

145 x 10 - 10 = 1440

1440 x 5 - 5 = 7195

7195 x 10 - 10 = 71940

Hence, the missing number is 145

Subject: Odd Man Out
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