Question

find the sum of all multiples 3 between 5 and 64​

Answer 1

Answer:

$56 \times 56 = 523$

Answer 2

Answer:

Sum of multiples of 3 between 5 and 64.

6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60 63

The sum of the above multiples is 690 :)