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Q.1.     How many 3-digit numbers can be formed from the digits 1, 2, 3, 4 and 5 assuming that
            (i) repetition of the digits is allowed?
  

Answers (1)

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The five  digits are 1, 2, 3, 4 and 5

As we know that repetition of the digits is allowed,

so , unit place can be filled by any of five digits.

Similarly , tens and hundreds digits can also be filled by any of five digits.

\therefore Number of 3-digit numbers can be formed =5\times 5\times 5=125

Posted by

seema garhwal

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