SOLUTION: 1+5+9+ ... +49+53

Question 1084729: 1+5+9+ ... +49+53
Answer by jorel1380(3719) (Show Source): You can put this solution on YOUR website!
The equation for this is Σ(4n+1), or

The first few terms of this AP are:
a=1, a+d=5, a+2d=9, a+3d=13, ...
or, just: 1, 5, 9, 13, ...
The Sum of the first n terms is given by:

So substituting a=1, d=4 and n=14 gives:

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