Finite Math Examples

Find the Number of Possibilities
P57
Step 1
Evaluate P57 using the formula Prn=n!(n-r)!.
7!(7-5)!
Step 2
Subtract 5 from 7.
7!(2)!
Step 3
Simplify 7!(2)!.
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Step 3.1
Rewrite 7! as 765432!.
765432!(2)!
Step 3.2
Cancel the common factor of 2!.
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Step 3.2.1
Cancel the common factor.
765432!(2)!
Step 3.2.2
Divide 76543 by 1.
76543
76543
Step 3.3
Multiply 76543.
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Step 3.3.1
Multiply 7 by 6.
42543
Step 3.3.2
Multiply 42 by 5.
21043
Step 3.3.3
Multiply 210 by 4.
8403
Step 3.3.4
Multiply 840 by 3.
2520
2520
2520
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 [x2  12  π  xdx ] 
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