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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?

A- 6

B- 27

C- 24

D- 16

Note by Mehdi Balti
1 year, 9 months ago

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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. Rajen Kapur · 1 year, 9 months ago

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@Rajen Kapur Correct! Saubia Ansari · 1 year, 9 months ago

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answer is D :) 16 Raj Rajput · 1 year, 9 months ago

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@Raj Rajput Yeap ofcrouse it answer will be 16 but could you explanation?? Mehdi Balti · 1 year, 9 months ago

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@Mehdi Balti 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 :) Raj Rajput · 1 year, 9 months ago

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Comment deleted Oct 10, 2015

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@Akshat Sharda And I think it is wrong :) Mehdi Balti · 1 year, 9 months ago

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@Mehdi Balti I was thinking that repetition is not allowed. Akshat Sharda · 1 year, 9 months ago

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