SOLUTION: 3+8+13+18+...+48 what is the sum of the sequence

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Question 305901: 3+8+13+18+...+48 what is the sum of the sequence
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
a0=3=3
a1=3+5=8
a2=3+5+5=13
a3=3+5+5+5=18
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a9=3+5+5+5+...+5=48
The sum is then 10*3 plus the sum from 1-9 multiplied by 5.
S=10%2A3%2B%289%289%2B1%29%2F2%29%2A5
S=30%2B225
S=255