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
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