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Permutations And Combinations

Question

Is 3! + 4! = 7!

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Solution

3! + 4! = (3 x 2 x 1) + (4 x 3 x 2 x 1) = 6 + 24 = 30
7! = 7 x 6 x 5 x 4 x 3 x 2 x 1 = 5040
∴ $space space space space 3 factorial space plus space 4 factorial space not equal to space 7 factorial$

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Permutations And Combinations

Is 3! + 4! = 7!

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