Question

find the ap whose third term is 16 and seventh term is 40

Answer 1

here is ur in the attachment above...........
further AP =a+d,a+2d ............
therefore the answer is
4,10,16,22..........................
hope it helps

Answer 2

a+2d=16...... eq (1)
a+6d=40...... eq (2)

eq (1)-2)

-4d=-24
d=6
put d=6 in eq (1)
a+2×6=16
a=16-12=4

ap=4,4+6,10+6......
ap=4,10,16...