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Proof by mathematical induction : P (A1 ∪ A2 ∪ ... ∪ An) ≤ P (A1) + P (A2) ... P (An) + P (An).
Xiela .
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long card P (A1) ≤ P (A1), and assume that this statement is true , then card P (A1U. ... UAn +1) ≤ P (A1) + .... + P (An +1) was established to
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pro , advanced algebra operations do not get the forum to find someone to help you do it. .
You just need to prove
A (n)

A (n)

A (n +1)

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, do not see understand
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I would not ......
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probability Mody , events and happenings intersection between either have , or do not have any intersection of two events , there is the less , there is equal .