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

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

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TopNewestLet 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, 3 months ago

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– Saubia Ansari · 1 year, 3 months ago

Correct!Log in to reply

answer is D :) 16 – Raj Rajput · 1 year, 3 months ago

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– Mehdi Balti · 1 year, 3 months ago

Yeap ofcrouse it answer will be 16 but could you explanation??Log in to reply

– Raj Rajput · 1 year, 3 months ago

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 :)Log in to reply

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– Mehdi Balti · 1 year, 3 months ago

And I think it is wrong :)Log in to reply

– Akshat Sharda · 1 year, 3 months ago

I was thinking that repetition is not allowed.Log in to reply