Question 644114: A bag contains "n"cards each having one of the numbers 1,2,3,4,.....n written on it. If all numbers are used the probability of drawing a card with a number less than or equal to 10 is 4/10. How many cards are in the bag?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! A bag contains "n"cards each having one of the numbers 1,2,3,4,.....n written on it. If all numbers are used the probability of drawing a card with a number less than or equal to 10 is 4/10. How many cards are in the bag?
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There are 10 cards with numbers less than or equal to 10.
Equation:
10/n = 4/10
Invert:
n/10 = 10/4
n = 25
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Cheers,
Stan H.
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