Question 174371
Evaluate each expression..... 
7. 6P4 = 6!/(6-4)! = 6!/2! = 6*5*4*3 = 360
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8. 5(3P2) = 5[3!/(3-2)!] = 5[3!/1!] = 5*3*2*1 = 6
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9. 5C2 + 5C1 = [5*4/1*2] + [5/1] = 10+5 = 15
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10. 7C3/7C4 = [7*6*5/1*2*3]/[7*6*5*4/1*2*3*4] = 1
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11. There are 14 different types of boxed nails in the hardware store. You plan to buy 5 different types of boxed nails. How many different combinations are there?
14C5 = [14*13*12*11*10]/[1*2*3*4*5] = 2002
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12. In how many different orders can six colored blocks be chosen from a set of 23 different blocks? 
23C6 = 100947
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Cheers,
Stan H.