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How many permutations of the set {A, B, C, D, E, F, G, H} a) Contain...

How many permutations of the set {A, B, C, D, E, F, G, H}

a) Contain the string DEF?

b) Contain the strings ABE and EFG?

c)Have D next to C?

d) Contain the strings DCB and BAD?

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