Which term of AP 3,15,27,39.......is 120 more than its 53rd term?

1.	Which term of AP 3,15,27,39.......is 120 more than its 53rd term?
Answer» a=3,d=12,an=53an= a+(n-1)dan53=3+(52)×12 =3+624=627 Now add 120.627+120= 747747=a+(n-1)d 747= 3+(n-1)12747-3=(n-1)12744/12=(n-1)62 =n-1n=62+1=63 term

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