Help me to answer this. Answer only needed.

nPn-1 = 67

(n - r)n = nPr + 1

nPn = (nPr)( n - rPn - r)

nPr = n( n - rPn - r)

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ANTIDISESTABLISHMENTARIANISM

Find the number of permutations of the letters of each word?

a. DIFFERENT

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