How many odd numbers of three digits each can be formed from the digits 2,4,6 and 7 if repetition of digits is permitted?
2 years ago
Let the three digit number be HTO. H and T can take any of the 4 values whereas O can be only 7. 4 x 4 = 16 possibilities.
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answer is D :) 16
Yeap ofcrouse it answer will be 16 but could you explanation??
third digit is seven as number is odd , for first and second digit 4 possibilities for both as repetition is allowed otherwise it would be 3 and 2 respectively, so as repetition is allowed we have 4x4x1=16 is the answer :)
Oct 10, 2015
And I think it is wrong :)
I was thinking that repetition is not allowed.