SOLUTION: How can I write the following sequence in sigma notation? 6+16+26+36?

Question 970884: How can I write the following sequence in sigma notation? 6+16+26+36?
Found 2 solutions by MathLover1, MathTherapy:
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
Notice this is an arithmetic series. Must use the formula to find the explicit formula.
is common difference between each two consecutive terms,
first term is and counting the terms, the fourth term is ; so, the number of the terms is =,,,
then nth term formula is:
where =,,,
check:
if

if

if

if

then

Answer by MathTherapy(10552) (Show Source): You can put this solution on YOUR website!
How can I write the following sequence in sigma notation? 6+16+26+36?

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