Aptitude - Numbers - Discussion

Discussion Forum : Numbers - General Questions (Q.No. 3)
3.
It is being given that (232 + 1) is completely divisible by a whole number. Which of the following numbers is completely divisible by this number?
(216 + 1)
(216 - 1)
(7 x 223)
(296 + 1)
Answer: Option
Explanation:

Let 232 = x. Then, (232 + 1) = (x + 1).

Let (x + 1) be completely divisible by the natural number N. Then,

(296 + 1) = [(232)3 + 1] = (x3 + 1) = (x + 1)(x2 - x + 1), which is completely divisible by N, since (x + 1) is divisible by N.

Discussion:
137 comments Page 10 of 14.

Madhu said:   9 years ago
How you take 2^96 +1 exactly?

Antony mary said:   9 years ago
Confused with this problem. Let me know the shortcut method?

Rayanna said:   9 years ago
I can't understand please explain me easily.

Sravanthi said:   9 years ago
I can't understand. Please explain it.

Sravanthi said:   9 years ago
I don't understand this problem. Please explain it in a simple way.

Nishu kumari said:   9 years ago
a^n + b^n is divisible by a + b only when n is odd. Suppose 2^32 is a then (2^32) ^3 = 2^96 i.e. a^3 which is odd means a^3 + b^3 here b=1. i.e, a^3 + b^3 is divisible by a + b.

Ambika said:   9 years ago
Was it possible to use power cycle of 2? Can anyone please explain how to use this?

Karthika said:   9 years ago
I could not understand the problem please explain me easily.

Owais Majeed said:   9 years ago
It is written in question no should be completely divisible.

For that number should be greater than given number i.e. 2^32+1.

Ex 1/2 = 0.5 (not completely divisible).

4/2 = 2 (completely divisible).

So option A, B, C all three numbers are less than given number 2^32 +1.

Now come on option D = 2^96+1. Clearly shows number is greater than 2^32+1.

This is what up to which some logic can b made.

Rest how it is possible to refer to given explanation of the question.

Thanks.

Mahalakshmi said:   9 years ago
I can't understand please explain again in a simple way.


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