Question

Solve this problem plz

Answer 1

let the 4 consecitive terms of an AP be ..
a-3d ,a-d, a+d, a+3d

a-3d+a-d+a+d+a+3d= 12
4a=12
a=3

t3 +t4 =14
a+d+a+3d=14
2a+4d=14
a+2d=7
3+2d=7
2d=7-3
2d=4
d=2