Which term of the AP 3,15,27,39... will be 120 more than it’s 21st term
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ANSWER:-↙️↙️✔✔
a=3, d=12
a21=a+20d
a21=3+20*12
a21=240+3=243
According to question, 243+120=363
an=a+(n-1)d
363=3+(n-1)12
363-3=12n-12
360+12=12n
372=12n
n=372/12=31
So 31st term is 120 more than 21st term
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