This is a question I am unable to solve. Please help me find the answer.

Find the least integer greater than 0 whose digit comprises of only 0s and 1s, and which is perfectly divisible by 225.

This is a question I am unable to solve. Please help me find the answer.

Find the least integer greater than 0 whose digit comprises of only 0s and 1s, and which is perfectly divisible by 225.

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TopNewestFirst off a number is divisible by 225 if and only if it is divisible by both 25 and 9.

Now, note that a number is divisible by 25 if and only if the last two digits (last from the left) are divisible by 25 (for example 455739250 is divisible by 25 as 50 is divissible 25 and 5028564 is not as 64 is not divisible by 25).

So, the last two digits of the required number must be 0.

Now, a number is divisible by 9 if and only if the sum of the digits is divisible by 9.

Hence, there must be nine 1 s in the required number.

And so, the least number with the desired properties is:

\[ \large 11,111,111,100 \] – Deeparaj Bhat · 10 months, 2 weeks ago

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– Nilabha Saha · 10 months, 2 weeks ago

Thank you very much for the simple explanation.Log in to reply

– Deeparaj Bhat · 10 months, 2 weeks ago

You're welcome.Log in to reply

Genius @Bhat – Ayanlaja Adebola · 10 months, 2 weeks ago

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Ans is 11,111,111,100 – Hemanth K · 10 months, 2 weeks ago

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– Nilabha Saha · 10 months, 2 weeks ago

Are you Hemath K of N.P.S. YPR. Please forgive me if it is not you.Log in to reply