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Verified answer
7 x 6 x 5 x 4 x 3 x 2 x 1 7!7 x 6 x 5 = -------------------------------- = ------
4 x 3 x 2 x 1 4!
7 x 11 x 10 x 9 x 8 = 11 x 10 x 9 x 8 x 7
11 x 10 x 9 x 8 x ..... x 2 x 1
= ------------------------------------
7 x 6 x 5 x 4 x 3 x 2 x 1
11 !
= -------
7!
1/(5 x 6 x 7), dipandang sebagi 7 x 6 x 5
Sehingga :
4!
1/(7 x 6 x 5) = ------
7!
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Verified answer
4).5).
6.
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