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Q:

2.5, 3.5, 9, 40, ?

Find the next number in the above-given series?

A) 316 B) 328
C) 323 D) 340

Answer:   B) 328



Explanation:

2.5 × 1 + 1 = 3.5

3.5 × 2 + 2 = 9

9 × 4 + 4 = 40

40 × 8 + 8 = 328

Subject: Odd Man Out
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4

 

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58 = 32+72

 

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Here every number is based on the digits of previous number. Hence, 81 is the wrong number in the given series.

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