Question 273134
A(n)=2n+1
A{3}=2{3}+1
A{3}=7

A{5}=2{5}+1
A{5}=11

A{7}=2{7}+1
A{7}=15


the third term of the sequence is 7,and the fifth term of the sequence is 11,and the seventh term of the sequence is 15.