Question

if the first two terms of AP are -3 and 4 then find its 21th term

Answer 1

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Answer 2

Hi your answer is here

a= -3, d= 4+3=7, n= 21

An = a+(n-1)d
= -3 + (21-1)7
= -3 + 20×7
= -3 +140
An = 137

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