Question

nth term of AP is a n and if a 1 + a2 +a 3 is equal to 102 and a 1 is equal to 15 then find a 10​

Answer 1

Answer:

a1+a2+a3=102

a+a+d+a+2d=3a+3d

3a+3d=102

a=15

3(15)+3d=102

3d=102-45

3d=57

d=19

if d=19

a10=a+9d

15+9(19)

186

hope it helps