Answers

2014-10-10T18:20:46+08:00
This problem involves combination.
for 2 lawyers and 4 engrs you will have:
for 2 lawyers taken from 6lawyers
C =  \frac{6(5)}{2!}
C =  \frac{6(5)}{2(1)}
C =  \frac{30}{2}
C = 15
for 9 engrs taken 4
C =  \frac{9(8)(7)(6)}{4!}
C =  \frac{9(8)(7)(6)}{4(3)(2)(1)}
C =  \frac{3024}{24}
C = 126
multiply the two results to find the answer. you'll have:
C_t = 15(126)
C_t = 1890
or in the calculator, you just have to input,
 _{6} C_2 (_9 C _4) = 1890
for the next question - 3 lawyers, 3 engrs
_6 C _3 (_9 C _3) = 1680
for 6 engineers:
_9 C _6 = 84
all lawyers:
_6 C _6 = 1
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tnx a lot,it will help me a lot....godbless