Question

35. Find the sum of the integers between 1 & 200 which are multiples of 3.
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Answer 1

Answer:

4422

Step-by-step explanation:

Required sum is

3 + 6 + ..... 198

First find n

$n \: = \frac{198 - 3}{3} + 1 = 66$

Use formula for Sn

$s = \frac{n}{2} (a + l) = \frac{66}{2} (3 + 198) = 4422$