Aptitude - Numbers - Discussion
Discussion Forum : Numbers - General Questions (Q.No. 55)
55.
Which of the following numbers will completely divide (4915 - 1) ?
Answer: Option
Explanation:
(xn - 1) will be divisibly by (x + 1) only when n is even.
(4915 - 1) = {(72)15 - 1} = (730 - 1), which is divisible by (7 +1), i.e., 8.
Discussion:
16 comments Page 2 of 2.
Praneel said:
9 years ago
Agree @Rashid.
Sush said:
8 years ago
Can anyone please explain how to find 7 power 6-4 power 6 is divisible by?
Vicky said:
8 years ago
X^n-y^n=x-y.
So,
49^15-1^15=49-1=48.
48÷8....48 is divisible by 8 so, 8 is answer.
So,
49^15-1^15=49-1=48.
48÷8....48 is divisible by 8 so, 8 is answer.
Zaki said:
6 years ago
Why not 50?
Gayathri Thota said:
5 years ago
(x^n-1) is divisible by x-1 when n is odd
Given
(49^15-1) is divisible by 49-1 i.e 48
48 is completely divisible by 8.(Here 15 is odd right)
Can we do it in this way?
Given
(49^15-1) is divisible by 49-1 i.e 48
48 is completely divisible by 8.(Here 15 is odd right)
Can we do it in this way?
Silverstar Tariang said:
5 years ago
a^n-b^n=a-b i.e 49-1=48 which is divisible by 8.
So the answer is 8.
So the answer is 8.
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