Question

For an A.P. , if t₄= 20 and t₇=32 , find a , d and tₙ *

Answer 1

Answer:

t4= t+ 3d= 20.......1

t7= t+ 6 d= 32......2

eqn 2-1= 3d= 12

d=4

a+ 3(4) =20

a= 8

tn= 8+ ( n-1) 4