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What should come in place of question mark (?) in the following number series? 15, 21, 54, 180, 744, ?   

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What should come in place of question mark (?) in the following number series?

15, 21, 54, 180, 744, ?   


1). 3750
2). 3780
3). 3775
4). 3772


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1 answers

3 vote
Answered by on | Votes 3 |

⇒ 15 × 1 + 2 × 3 = 21

⇒ 21 × 2 + 4 × 3 = 54

⇒ 54 × 3 + 6 × 3 = 180

⇒ 180 × 4 + 8 × 3 = 744

⇒ 744 × 5 + 10 × 3 = 3750

∴ ? = 3750

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