Anonymous
Anonymous asked in Science & MathematicsMathematics · 1 decade ago

# How do you work this math problem out? i know the answer but not how to get it.?

an integer from 100 through 999 inclusive is to be chosen at random. what is the probability that the number chosen will have 0 as at least 1 digit?

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• M3
Lv 7

0's can occur only for the 2nd & 3rd digits

P[# chosen has at least one 0]

= P[zero as 2nd digit] + P[zero as 3rd digit] - P[zero both digits]

= 1/10 + 1/10 - 1/10*1/10

= 19/100

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• 1 decade ago

1 out of 999

i guess