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