Solution
The numbers are of the form $$n^3-1$$
$$(2)^3-1$$ = 7
$$(3)^3-1$$ = 26
$$(4)^3-1$$ = 63
$$(5)^3-1$$ = 124
$$(6)^3-1$$ = 215
$$(7)^3-1$$ = 342
$$(8)^3-1$$ = 511
=> Ans - (D)
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