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National and Regional Contests
USA Contests
MAA AMC
AMC 8
1997 AMC 8
11
11
Part of
1997 AMC 8
Problems
(1)
1997 AJHSME #11 - Mean of Divisors
Source:
6/30/2011
Let
N
\boxed{N}
N
mean the number of whole number divisors of
N
N
N
. For example,
3
=
2
\boxed{3}=2
3
=
2
because 3 has two divisors, 1 and 3. Find the value of
11
×
20
.
\boxed{\boxed{11}\times\boxed{20}}.
11
×
20
.
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A
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6
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B
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8
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C
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12
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(
D
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16
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E
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24
<span class='latex-bold'>(A)</span>\ 6 \qquad <span class='latex-bold'>(B)</span>\ 8 \qquad <span class='latex-bold'>(C)</span>\ 12 \qquad <span class='latex-bold'>(D)</span>\ 16 \qquad <span class='latex-bold'>(E)</span>\ 24
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(
A
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<
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6
<
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(
B
)
<
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8
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(
C
)
<
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12
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>
(
D
)
<
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>
16
<
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−
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>
(
E
)
<
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>
24
AMC