Aptitude - Numbers - Discussion
Discussion Forum : Numbers - General Questions (Q.No. 104)
104.
On multiplying a number by 7, the product is a number each of whose digits is 3. The smallest such number is:
Answer: Option
Explanation:
By hit and trial, we find that
47619 x 7 = 333333.
Discussion:
11 comments Page 2 of 2.
RAJ said:
2 weeks ago
@All.
If all the digits should be 3 then obviously the product must be divisible by 3 as well as 7, it might be divisible by other numbers but 3 and 7 are fixed, and thus, our search space is reduced.
Now, check the numbers which is divisible by 3 also, and smallest between a and d is a, therefore. Answer is A.
Correct me if I am wrong.
If all the digits should be 3 then obviously the product must be divisible by 3 as well as 7, it might be divisible by other numbers but 3 and 7 are fixed, and thus, our search space is reduced.
Now, check the numbers which is divisible by 3 also, and smallest between a and d is a, therefore. Answer is A.
Correct me if I am wrong.
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