Question:
\(5^6 - 1\) is divisible by
\(5^6 - 1\) is divisible by
Show Hint
Factor \(5^6 - 1\) as a difference of squares or cubes.
Updated On: Nov 5, 2026
- \(31\)
- \(13\)
- \(5\)
- None of these
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Factor:
\(5^6 - 1 = (5^3)^2 - 1 = (5^3 - 1)(5^3 + 1) = 124 \times 126\).
Step 2: Prime factors:
\(124 = 4 \times 31\) and \(126 = 2 \times 63\). So \(5^6 - 1 = 15624\) is divisible by \(31\).
Step 3: Check others:
\(15624 \div 13\) leaves remainder \(11\) (since \(13 \times 1201 = 15613\)), and the number ends in 4, so it is not divisible by \(5\).
Final Answer:
The correct option is (1): \(31\).
\(5^6 - 1 = (5^3)^2 - 1 = (5^3 - 1)(5^3 + 1) = 124 \times 126\).
Step 2: Prime factors:
\(124 = 4 \times 31\) and \(126 = 2 \times 63\). So \(5^6 - 1 = 15624\) is divisible by \(31\).
Step 3: Check others:
\(15624 \div 13\) leaves remainder \(11\) (since \(13 \times 1201 = 15613\)), and the number ends in 4, so it is not divisible by \(5\).
Final Answer:
The correct option is (1): \(31\).
Was this answer helpful?
0
0
Top CAT Quantitative Aptitude Questions
- In a triangle ABC,AB=AC=8cm. A circle drawn with BC as diameter passes through A. Another circle drawn with center at A passes through B and C. Then the area,in sq.cm,of the overlapping region between the two circles is
- The simple interest accrued on an amount of Rs.25,000 at the end of three years is Rs.7,500. What would be the compound interest accrued on the same amount at the same rate in the same period?
- What is the sum of all roots of the equation \(|x+4|^2–10|x+4|=24\)?
- A solid metal sphere is melted and smaller spheres of equal radii are formed. 10% of the volume of the sphere is lost in the process. The smaller spheres have a radius which is \(\frac{1}{9}\text{th}\) the larger sphere. If 10 litres of paint were needed to paint the larger sphere,how many litres are needed to paint all the smaller spheres?
- The ratio of the ages of a husband and his wife when they got married was 6:5. 4 years and 6 years after their marriage they had their 1st and 2nd children. The sum of the present ages of the husband and wife is 6.4 times the sum of the present ages of their children. The average age of the family at present is 18.5 years. Find the ratio of the ages of the husband and wife when their second child was born.
View More Questions
Top CAT Number System Questions
- Consider a sequence \( S \) whose \( n \)th term \( T_n \) is defined as \( T_n = 1 + \frac{3}{n} \), where \( n = 1, 2, \ldots \). Find the product of all the consecutive terms of \( S \) starting from the 4th term to the 60th term.
- Let \( P = \{2, 3, 4, \ldots, 100\} \) and \( Q = \{101, 102, 103, \ldots, 200\} \). How many elements of \( Q \) are there such that they do not have any element of \( P \) as a factor?
- Find the remainder when \( 2^{1040} \) is divided by 131.
- \( p \) is a prime and \( m \) is a positive integer. How many solutions exist for the equation \[ p^5 - p = (m^2 + m + 6)(p - 1)? \]
- A certain number written in a certain base is 144. Which of the following is always true?
View More Questions
Top CAT Questions
- Compare and contrast between Portia and Jessica characters in Merchant of Venice.
- In a triangle ABC,AB=AC=8cm. A circle drawn with BC as diameter passes through A. Another circle drawn with center at A passes through B and C. Then the area,in sq.cm,of the overlapping region between the two circles is
- The simple interest accrued on an amount of Rs.25,000 at the end of three years is Rs.7,500. What would be the compound interest accrued on the same amount at the same rate in the same period?
- What is the sum of all roots of the equation \(|x+4|^2–10|x+4|=24\)?
- A solid metal sphere is melted and smaller spheres of equal radii are formed. 10% of the volume of the sphere is lost in the process. The smaller spheres have a radius which is \(\frac{1}{9}\text{th}\) the larger sphere. If 10 litres of paint were needed to paint the larger sphere,how many litres are needed to paint all the smaller spheres?
View More Questions