Q.

How many terms are to be added to make the sum 52 in the series  −8+−6+−4+... ?

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a

13

b

15

c

14

d

16

answer is A.

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Detailed Solution

Sn=52⇒n22−8+n−12=52⇒n(2n−18)=104⇒n(n−9)=52⇒n=13
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