Question

Which term of ap 3 15 27 will be 120 more than its 21st term

Answer 1

21st term =a+20d=3+240=243

120more=243+120=363

363 is some nth term

it can be written as 3+(n-1)d

363=3+(n-1)12

n=31

ans is 31st term ie 363

Answer 2

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