samara49
09.10.2019 •
Mathematics
Which expression has the same value as )? a -8 4 b -8 (-4) c 8 (-4) d 4 - (-8)
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Ответ:
Ответ:
1716
Step-by-step explanation:
13C7 => 13!/7!6!
or, the seven can be selected in 13 x 12 x 11 x 10 x 9 x 8 x 7 ways => 8648640
But, the seven can be arranged in 7 x 6 x 5 x 4 x 3 x 2 x 1 ways => 5040
so, total => 8648640/5040 = 1716