Find a wrong number in a series:
7, 28, 63, 124, 215, 342, 511.

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124

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215

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342

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Solution

The correct option is B 28
Clearly the correct sequence is :
$2^{3} - 1, 3^{3} - 1, 4^{3} - 1, 5^{3} - 1, 6^{3} - 1, 7^{3} - 1, 8^{3} - 1. ∴ 28 i s w r o n g a n d s h o u l d b e r e p l a c e d w i t h 3^{3} - 1 i . e . 26$ .
Hence, the answer is (b).

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Similar questions

7

28

63

124

215

342

511

7, 26, 63, 124, 215, 342, ?

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