Aptitude - Numbers - Discussion
Discussion Forum : Numbers - General Questions (Q.No. 66)
66.
Which of the following numbers is divisible by each one of 3, 7, 9 and 11 ?
Answer: Option
Explanation:
639 is not divisible by 7
2079 is divisible by each of 3, 7, 9, 11.
Discussion:
8 comments Page 1 of 1.
Prasanna kartik said:
1 decade ago
Hi guys,
We can solve this by taking LCM of 3, 7, 9 and 11 which is 693. Which is not in the options but multiples of this should be divisible by the same series which is given. So from the options 2079 is 693x3 so it is a correct answer.
We can solve this by taking LCM of 3, 7, 9 and 11 which is 693. Which is not in the options but multiples of this should be divisible by the same series which is given. So from the options 2079 is 693x3 so it is a correct answer.
(3)
Suresh said:
5 years ago
Can someone explain the divisibility rule of 7 clearly?
(3)
Sukhdeep singh said:
9 years ago
Divisibility rule of 7:
The unit digit of the given number is doubled and then it is subtracted from the number obtained by omitting the unit digit. If the remainder is divisible by 7, the given number is also divisible by 7.
Rule for 9:
If the sum of the digits is divisible by 9.
The unit digit of the given number is doubled and then it is subtracted from the number obtained by omitting the unit digit. If the remainder is divisible by 7, the given number is also divisible by 7.
Rule for 9:
If the sum of the digits is divisible by 9.
(1)
Namrata Tiwari said:
7 years ago
Thanks @Sukhdeep.
(1)
SINDHU said:
5 years ago
Here the answer is 2079.
divisibility rule of 7 : Double the last digit and subtract it from a number made by the other digits. The result must be divisible by 7.
Here 2079>>>lat number is 9,if we double it will be 18 and subtract from 2097 we get 189.
189 is completely divisible by 7.
divisibility rule of 7 : Double the last digit and subtract it from a number made by the other digits. The result must be divisible by 7.
Here 2079>>>lat number is 9,if we double it will be 18 and subtract from 2097 we get 189.
189 is completely divisible by 7.
(1)
Arunkrish said:
1 decade ago
Option (c) & (d) are divisible by which number?
Shreya said:
9 years ago
Can someone tell me the divisibility rule for 7 and 9?
Shrey said:
7 years ago
Sum of digits of 2079 is 18. Divisibility rule of 3 says the sum of number must be divisible by 3 if the sum of digits is divisible by 3. That isn't happening here, right?
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