How many 5-card hands can be formed that include exactly 2 pairs? (example 2 queens, 2 kings)

Mathematics

1 answer:

iVinArrow [24]3 years ago

3 0

10. Here's why:
K,K,K,K,QQ,Q,Q,J,JJ,J,10,10,1010,9,9,9,98,8,8,8,77,7,7,6,66,6,5,5,55,4,4,4,43,3,3,3,22,2,2,A,AA,A

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=±22
x
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±
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2

Using the fact that 2=ln2
2
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e
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⁡
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e
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2
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x
e
x
=
a
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=
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(
a
)
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−
x
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⁡
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2
=
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(
∓
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⁡
2
2
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∓
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x
, ()
W
(
x
)
has 2 real solutions for −−1<<0
−
e
−
1
<
x
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0
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−ln22
−
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2
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