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Softa [21]
3 years ago
14

There is a bag filled with 5 blue and 6 red marbles.

Mathematics
1 answer:
Lorico [155]3 years ago
5 0

There are 6+5 marbles.

Of those, 5 are red.

The chances of drawing a red marble are 5/11

Since you replace the marble you drew, the chances each draw remain 5/11

You cannot draw two red marbles without drawing a red marble on your first draw, so the odds of you making a second draw are 5/11. The odds of that also being red are 5/11… but we only care about that 5/11ths the time

5/11*5/11=25/121

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