Question

Find the sum of all multiples of 8 between 350 and 650
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Answer 1

Answer:

Hey mate! Here's your answer:

Step-by-step explanation:

a = 352, d = 8, an = 648, n = ?, Sn = ?

a + (n - 1)d = an

352 + (n - 1)8 = 648

(n - 1)8 = 296

n - 1 = 37

n = 38.

Sn = (n/2){2a + (n - 1)d}

Sn = (38/2){2(352) + (38 - 1)8}

Sn = 19 * {704 + (37)8}

Sn = 19 * {704 + 296}

Sn = 19 * 1000

Sn = 19000.

So the sum of all multiples of 8 between 350 and 650 is 19000.

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