Q. 8 B4.0( 4 Votes )

# Justify whether it is true to say that the following are the nth terms of an AP.

Put n = 1, 2, 3, 4

We get

a1 = 3(1)2 + 5 = 8

a2 = 3(2)2 + 5 = 17

a3 = 3(3)2 + 5 = 32

a4 = 3(4)2 + 5 = 53

List of AP is 8, 17, 32, 53. . . .

a2 - a1 = 17 - 8 = 9

a3 - a2 = 32 - 17 = 15

As

a3 - a2 is not equal to a2 - a1

the list is not an AP

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