Question 550041
A committee which consists of two mathematicians and three scientists will be formed from four mathematicians and six scientists. How many possible committees can be formed if:
a. any of the mathematicians and scientists are included?
Ans: 4C2*6C3
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b. one particular scientist must be in the committee?
Ans: 1*5C2*4C2 
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c. two particular mathematicians must be in the committee?
Ans: 1*1*6C3
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d. two particular scientists must not be in the committee?
ans: 4C2*4C3
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Cheers,
Stan H.
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