Question 9

Complete the series.
7, 26, 63, 124, 215, 342, (....)

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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