Question

In the arithmetic sequence 1,3,5,7,9,... Which term is 121?

Answer 1

Answer:

61

Step-by-step explanation:

As,An=121,D=2,N=?,A=1

An=A+(N-1)D

121=1+(N-1)2

121=1+2N-2

121=2N-1

121+1=2N

122=2N

122/2=N

61=N