[計量] Seven one-dollar bills ...
seven one-dollar bills are to be distributed among
Lucia, Gomez, Domingo,
so that each person receive at least $1
Col A Col B
the number of ways the total number
to distribute the bill of ways to distribute
so that at least one the bills
person receive at
least $3
Ans: C
拜託大家了~
還是不會 請大家解一下
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