Question

3,15, 27,39,..... will be 120 more than its 21st term

Answer 1

Answer:

Step-by-step explanation:

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

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Answer 2

here,a=3
d=12
a of n =
$a + (n - 1)d$
a of 21=3+[21-1]12
=3+20*12
=243
ATQ
243+120=363
PUTTING IT IN SAME FORMULA
N=31