Question

6) If the sum of first 'n' terms of an AP Sn = (2n- +3n), then the common difference in the
AP is

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Answer 1

Answer:

4

Step-by-step explanation:

$S_{n}$ = (2$n^{2}$ + 3n )

Put n = 1 we get

$S_{1}$ = 5 OR we can write

a = 5...(1)

Similarly put n = 2 we get

$S_{2}$ = 14 OR we can write

2a +d  = 14

using equation 1 we get

2 × 5 + d = 14

10 +d = 14

d = 14-10 = 4