7. In a bag there are 7 red marbles and 4 white marbles. Find number of ways to take 2 red marbles and 2 white marbles. 8. On a circle there are 8 different points. How many bowstrings can be made from the 8 points?
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To solve this, we can use combinations. The number of ways to choose 2 red marbles from 7 is given by the combination formula: C(7, 2) = 7! / (2! * (7-2)!) = 7! / (2! * 5!) = (7 * 6) / (2 * 1) = 21. Similarly, the number of ways to choose 2 white marbles from Show more…
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