Which number will replace the question mark () in the following number series 5, 4, 6, 15, 56, ?
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Option 3 : 275
The pattern followed here is:
5 × 1 = 5 -1 = 4
4 × 2 = 8 - 2 = 6
6 × 3 = 18 - 3 = 15
15 × 4 = 60 - 4 = 56
So, the next number is:
56 × 5 = 280 - 5 = 275
Hence, the correct answer is "275".
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