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sveta [45]
3 years ago
14

Write a formula for the sum of the first n integers that are divisible by 3

Mathematics
1 answer:
tino4ka555 [31]3 years ago
5 0
3*1+3*2+3*3+,,,+3n= 3*(1+2+...+n)
=3*n(n+1)/2


cause 1+2+...+n=n(n+1)/2
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Answer:

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