Question 985467
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There are 3 defective pieces and 12 non-defective pieces.

Number of ways to receive exactly 2 defective pieces and 3 non-defective pieces:

3C2*12C3

Number of ways to receive exactly 3 defective pieces and 2 nondefective pieces:

3C3*12C2

Answer 3C2*12C3 + 3C3*12C2

Edwin</pre>