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What is the sum of the two digit multiples of 11?
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What is the sum of the two digit multiples of 11?

What is the sum of the two digit multiples of 11?-example-1
User PYPL
by
6.4k points

2 Answers

3 votes
11+22+33+44+55+66+77+88+99
33+77+121+165+99
110+286+99
396+99
495
User Amith Dissanayaka
by
7.1k points
7 votes

S = (1)/(2)n(a + l)


a = 11

l = 99

n = 9


S = (1)/(2)9(11 + 99)

S = (1)/(2)9(110)

S = (990)/(2)

S = 495
User Wintour
by
6.8k points
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