JEE MATHEMATICS MCQ: SEQUENCE OF SERIES

1 Easy

1 of 1

Application +4 | -1

Let

{S}_n

denotes the sum of

n

terms of an A.P. whose first term is

a

. If the common difference

d={S}_n-k {~S}_{n-1}+{S}_{n-2}

then

k=

View answer and explanation

Correct option: B

Option B (2) is correct because the value of k is found by substituting n=3 into the given equation and solving for k.

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\frac{3}{4}