Aptitude - Numbers - Discussion
Discussion Forum : Numbers - General Questions (Q.No. 21)
21.
Which of the following number is divisible by 24 ?
Answer: Option
Explanation:
24 = 3 x8, where 3 and 8 co-prime.
Clearly, 35718 is not divisible by 8, as 718 is not divisible by 8.
Similarly, 63810 is not divisible by 8 and 537804 is not divisible by 8.
Consider option (D),
Sum of digits = (3 + 1 + 2 + 5 + 7 + 3 + 6) = 27, which is divisible by 3.
Also, 736 is divisible by 8.
3125736 is divisible by (3 x 8), i.e., 24.
Discussion:
56 comments Page 3 of 6.
Bindu said:
1 decade ago
Hi Reddy :
They took 8 and 3 because 3*8=24 any number divisible by 24 should be divisible by its divisors
You can also take 4*6
They took 8 and 3 because 3*8=24 any number divisible by 24 should be divisible by its divisors
You can also take 4*6
Mayur said:
3 years ago
@Anil Meghwal.
718 is not completely divisible by 8 hence option A is ruled out. B
But, options C & D both are correct.
718 is not completely divisible by 8 hence option A is ruled out. B
But, options C & D both are correct.
(3)
Neha said:
8 years ago
@Thiru.
A set of numbers which do not have any other common factor other than 1 are called co-prime.
A set of numbers which do not have any other common factor other than 1 are called co-prime.
Janu said:
1 decade ago
Hello syama..
547804 is not divisible by 3..
divisible by means "remainder should be zero"
547804 is not divisible by 3..
divisible by means "remainder should be zero"
Kumaresan said:
9 years ago
I don't understand these methods. Please anyone tell me the shortcut method for solving this.
Sk.Gopinath Siva said:
1 decade ago
A set of numbers which do not have any other common factor other than 1 are called co-prime.
Yogi said:
8 years ago
I don't understand the methods. Please anyone tell me the shortcut method for solving this.
Prabhakaran said:
1 decade ago
@Bindhu.
4 and 6 are not co-prime, because they share the common factor 2; and gcd(4,6)=2.
4 and 6 are not co-prime, because they share the common factor 2; and gcd(4,6)=2.
Syama said:
1 decade ago
547804 is divisible by 2,3,4 then why its not divisible by 24.. can u explain?
Raj said:
10 years ago
Could please any one give clear explanation? Just give me the shortcut method.
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