Question

Find the sum of all the multiples of 6 between 200 and 400

Answer 1

Answer:

7614

Step-by-step explanation:

204, 210, 216 .....396

396 = 204 + (n-1)(6)

n = 27

$S_{27}$ = $\frac{27}{2} (2(204) + (27-1)6)$

$\\13.5(408+156)$

$\\7614$

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