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1. Find the sum of thee multiples of 3 less than 100. Hence or otherwise find the sum of the numbers less than 100 which are not multiples of 3. HELP PLEASE!!!
2. (Original post by Nastuwa--)
Find the sum of thee multiples of 3 less than 100. Hence or otherwise find the sum of the numbers less than 100 which are not multiples of 3.
What have you done so far

This is a fairly standard arithmetic series question
3. 1. The multiples of 3 less than 100 form the sequence:

3, 6, 9, 12, ..., 99

2. The sum of numbers less than 100 minus the sum of multiples of 3 less than 100 is equal to the sum of numbers less than 100 which are not multiples of 3.

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