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What should come in place of question mark ‘?’ in the following number series? 1, 2.5, 5.75, ?, 21.4375, 37.15625

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What should come in place of question mark ‘?’ in the following number series?

1, 2.5, 5.75, ?, 21.4375, 37.15625


1). 11.625
2). 12.625
3). 15.625
4). 11.675


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1 answers

3 vote
Answered by on | Votes 3 |

⇒ 1 × 1.5 + 1 = 2.5

⇒ 2.5 × 1.5 + 2 = 5.75

⇒ 5.75 × 1.5 + 3 = 11.625

⇒ 11.625 × 1.5 + 4 = 21.4375

⇒ 21.4375 × 1.5 + 5 = 37.15625

∴ ? = 11.625

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