Question

Which term of the A.P.:
3, 15, 27, 39, .... will be 120 more than its 53rd term?

Answer 1

Answer:

63rd term

Step-by-step explanation:

53rd term=a+52d

                =3+(52*12)

                =3+624

                =627

=627+120

=747

 an=a+d(n-1)

747=3+12(n-1)

747-3=12n-12

744=12n-12

744+12=12n

12n=756

n=756/12

n=63

so,63rd term of A.P. will be 120 more than its 53rd term