Question

Find an A.P whose nth trem is an=4n-5

Answer 1

Put n=1

a1 =-1,

Put n=2

a2=3

Put n=3

a3=7....

Answer 2

an=4n-5

a=4-5

a=-1

Put a=-1 in equation

- 1n=4n-5

-1n-4n=-5

-1-4n=-5

-3n=-5

n=-5+3

n=-2