Question 8

Select the number that DOES NOT belong to the following group.
0, 5, 12, 20, 32, 45

Solution

The numbers are of the form, $$(n^2-4)$$

$$(2)^2-4$$ = 0

$$(3)^2-4$$ = 5

$$(4)^2-4$$ = 12

$$(5)^2-4$$ = 21 $$\neq20$$

$$(6)^2-4$$ = 32

$$(7)^2-4$$ = 45

=> Ans - (C)

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