Question

3. Write first four terms of an arithmetic progression having a = 20 and
= -3​

Answer 1

1st term= a= 20

2nd term= a+d= 20+(-3)=20-3=17

3rd term= a+2d=20+2×(-3)=20-6=14

4th term=a+3d=20+3×(-3)=20-9=11