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What should come in place of the question mark (?) in the following number series. 7 26 63 124 215 ?

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

7 26 63 124 215 ?

(a) 330 (b) 321 (c) 342 (d) 356 (e) 339
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(c) 7 = 23 – 1
26 = 33 – 1
63 = 43 – 1
124 = 53 – 1
215 = 63 – 1
? = 73 – 1 = 342

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