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From the balls in the figure, 3 are drawn. In how many ways can the draw contain at least 2 red balls?

Competition practicePermutations & Combinations

A18
B12
C22
D35

Step-by-Step Solution

Exactly 2 red:

^{4} C_{2} \times^{3} C_{1} = 18

. All 3 red:

^{4} C_{3} = 4

. Total

22. (35 =^{7} C_{3}

has no condition.)

Answer: C) 22

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