Q25 of 140 Page 276

How many 3-letters words can be formed using a, b, c, d, e if

(i) repetition of letters is not allowed?


(ii) repetition of letters is allowed









any one of 6 letters



any one of the remaining 5 letters



any one of the remaining4 letters




i)if repetition of letters is not allowed then number of many 3-letters words that can be formed using a, b, c, d, e are


5 × 4 × 3=60









any one of 5 letters



any one of 5 letters



any one of 5 letters



ii) if repetition of letters is allowed then number of many 3-letters words that can be formed using a, b, c, d, e are


5 × 5 × 5=125


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