SOLUTION: Find the first six partial sums S1, S2, S3, S4, S5, S6 of the sequence whose nth term is given. 1, 5, 9, 13, . . .

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Question 1158704: Find the first six partial sums S1, S2, S3, S4, S5, S6 of the sequence whose nth term is given.
1, 5, 9, 13, . . .

Answer by MathLover1(20850) About Me  (Show Source):
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Find the first six partial sums S1, S2, S3,+S4, S5, S6 of the sequence whose nth term is given.
1, 5,+9, 13, . . .
as you can see, common difference is 4
d=5-1=4
d=9-5=4
so, next term will be 17, then comes+21, 25, and so on
S1=1
S2=1%2B5=6
S3=1%2B5%2B9=15
+S4=1%2B5%2B9%2B13=28
S5=1%2B5%2B9%2B13%2B17=45
S6=1%2B5%2B9%2B13%2B17%2B21=66