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Plz give this answer as fast as possible tried but not getting answer

Plz give this answer as fast as possible tried but not getting answer 

Question Image
Grade:11

1 Answers

Vikas TU
14149 Points
one year ago
Hii 
Best way to solve these type of question is from options, just assume any A.P. and put that A.P in the equation, get the ans and check in the option. The option which will match with the output will be your ans. 
I will provide detailed proof if u want.

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