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4 votes
Compute the sum of the first 40 positive multiples of 3

2 Answers

5 votes

Answer:

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Explanation:

User Elwhis
by
5.9k points
3 votes

Answer: 2460

Step-by-step explanation: Used a calculator, and added from 3 x 1, since the answer is the first 40 positive multiples.

Another way is: 3 + 6 + 9 + ... + 120. There are 40 numbers, so 20 pairs of 123. 123 x 20 + 2460 :)

HOPE THIS HELPS <3

User Richardtallent
by
5.5k points
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