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Re: The integers 1 through 5 are written on each of five cards. [#permalink]
1
saigre2020 wrote:
given events are mutually exclusive events

because outcome of sum getting 14 and 15 cannot happen at same time

so P(14 or 15)=P(14)+P(15)

P(14)=(3/125) (outcomes are (4,4,5) or (4,5,4) or (5,4,4))

P(15)=(1/125) (only one outcome (5,5,5)

so P(14 or 15)= (3/125)+(1/125)=4/125

option C is correct



The outcomes for P(14) are (5,5,4) (5,4,5) and (4,5,5)
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Re: The integers 1 through 5 are written on each of five cards. [#permalink]
edited

thank tou :-D
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Re: The integers 1 through 5 are written on each of five cards. [#permalink]
Cards must be replaced ?? Why then adding 5 two times
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Re: The integers 1 through 5 are written on each of five cards. [#permalink]
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Re: The integers 1 through 5 are written on each of five cards. [#permalink]
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