cadieux
cadieux
15-11-2014
Mathematics
Answered
What is the sum of the two digit multiples of 11?
Answer :
superkoopasirf
superkoopasirf
15-11-2014
[tex]S = \frac{1}{2}n(a + l)[/tex]
[tex]a = 11[/tex]
[tex]l = 99[/tex]
[tex]n = 9[/tex]
[tex]S = \frac{1}{2}9(11 + 99)[/tex]
[tex]S = \frac{1}{2}9(110)[/tex]
[tex]S = \frac{990}{2}[/tex]
[tex]S = 495[/tex]
Answer Link
awesome099
awesome099
15-11-2014
11+22+33+44+55+66+77+88+99
33+77+121+165+99
110+286+99
396+99
495
Answer Link
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