Question

Find the nth term of an ap whose ge
neral term is an=2n+1

Answer 1

A1=S1=3

S2=5

A2=2

D=-1

then put the value in an=a+(n-1)d

you will get n =1

Answer 2

Given :

• An = 2n + 1

To Find :

• nth term of the A.P

Solution :

An = 2n + 1

A1 = 2 × 1 + 1

A1 = 3

A2 = 2 × 2 + 1

A2 = 5

A.P = 3 , 5 , 7 ......

Now nth term of the A.P

★ An = a + ( n - 1 ) d ★

An = 3 + ( n - 1 ) 2

An = 3 + 2n - 2

An = 2n + 1