Question

1. Show that the sequence defined by an = 5n - 7 is an A.P., find its common difference,​

Answer 1

Answer:

it's simple

1st take n=1

then substitute n=1 in 5n-1 formula

then u will get a1 = 5*1-7

=5-7=-2

then substitute n=2 in the given formula

then u will get 5*2-7

=10-7=3

then find d

d=a2-a1

3-(-2)

=3+4

=7