Find the odd one out.
$7$ , $28$ , $63$ , $124$ , $215$ , $342$ , $511$

7

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28

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124

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215

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Solution

The correct option is C $28$
Clearly, the correct sequence is
$(2^{3} - 1), (3^{3} - 1), (4^{3} - 1), (5^{3} - 1), (6^{3} - 1), (7^{3} - 1), (8^{3} - 1)$
$∴$ $28$ is wrong and should be replaced by $(3^{3} - 1)$ i.e. $26$
Hence, the answer is B

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