The Storm roller coaster climbs to a height of 180 feet. The Snake roller coaster climbs to a height of 105 feet. How much highe
2 answers:
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Answer:
385 ways
Step-by-step explanation:
Given;
7 red balls
10 white balls
In how many ways can 4 balls be selected if there are more than 2 red balls.
Selecting 4 balls which must contain more than 2 red balls, will be 3 red balls and 1 white ball to make it 4 in total, or all the 4 balls selected will red balls.
= 3 red balls and 1 white ball OR 4 red balls
= 7C₃ x 10C₁ + 7C₄
Therefore, there are 385 ways of selecting 4 balls, if there are more than 2 red balls.