Question

the 7th term of an ap is four times its second term and 12th term is 2 more than 3 times of its fourth term of an arithmetic progressions​

Answer 1

a+6d=4(a+d)

a+6d=4a+4d

2d=3a------------------(1)

a+11d=3 (a+3d)+2

a+11d=3a+9d+2

2d=2a+2

2d=2 (a+1)

d=a+1

2d=3a

2 (a+1)=3a

2a+2=3a

a=2

d=2+1

d=3

ap is 2,5,8,....