Q.

A non constant A.P has common difference d and first term is (1-ad). If the sum of the first 20 terms is 20, then the value of ‘a’ is

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a

219

b

192

c

29

d

92

answer is B.

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Detailed Solution

sum of 20 terms =S20=2022(1-ad)+19d=20⇒a=19/2
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