Help with the steps

a,a+d, a+2d.... etc form arithmetic sequence.

For example 2,5,8,11,14,17,20 is an arithmetic sequence.

The sum = number of terms* (first term+last rerm)2/= 7*(2+20)/2 =7*11=77

The nth term is 2+(n-1)3. The fifth term is 2+4*3 =14

Secure Information

Content will be erased after question is completed.

Enter the email address associated with your account, and we will email you a link to reset your password.

Forgot your password?

Sign Up