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Let T={p, q, r, s, t}. The number of strings in S* of length 4 such that no symbols can be repeated.

(a) 120

(b) 625

(c) 360

(d) 36

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Correct option is (b) 625

To elaborate: Using the permutation rule, we can calculate that there will be total of 625 permutations on 5 elements taking 4 as the length.

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