Math, asked by gawademayuri, 3 months ago

i) The sum of the 3rd and 7th terms of an A.P. is 32 and their product is 220. Find
the sum of first twenty-one terms of the A.P. (Take the value of d positive).

Answers

Answered by panda360

7

Step-by-step explanation:

as a=16-4d

=16-4×3

=16-12

=4

*a=4

which is substituted in the sn formula

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