The outcome A="At least one" means {1,2,3,4,5......n} where n is the maximum possible outcome.
The only other outcome (B) left (i.e. the complement of the above event "at least one") is (B)={0}.
Therefore, by Kolmogorov's second axiom, A and B are complements, and
P(A)+P(B)=1
therefore
P(A)=1-P(B), or in words,
Probability of outcomes of "at least one" is the complement of the outcome of "0" item.
4/7 because the equation would be 2(7-5)
over
5+2
so it would be
2(2)
over
7
and then it would be
4
over
7
Answer:
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Two lions plus two Cubs per each line equals six lions.