Question : Which one of the following is a factor of the sum of the first twenty-five natural numbers?
Option 1: 26
Option 2: 24
Option 3: 13
Option 4: 12
Correct Answer: 13
Solution : Given: $n$ = 25 The sum of the first $n$ natural numbers = $\frac{n(n+1)}{2}$ = $\frac{25\times 26}{2}$ = 25 × 13 The factors of the sum of the first 25 natural numbers are 13 and 25. Hence, the correct answer is 13.
Application | Eligibility | Selection Process | Result | Cutoff | Admit Card | Preparation Tips
Question : The LCM of four consecutive numbers is 60. The sum of the first two numbers is equal to the fourth number. What is the sum of the four numbers?
Option 1: 17
Option 2: 14
Option 3: 21
Option 4: 24
Question : The sum of three consecutive natural numbers divisible by 3 is 45. The smallest number is:
Option 1: 18
Option 2: 3
Option 3: 12
Option 4: 9
Question : A boy added all natural numbers from 1 to 12, but he added one number twice, due to which the sum became 80. What is the number that he added twice?
Option 1: 3
Option 2: 2
Option 3: 7
Option 4: 8
Question : Which one of the following pairs is incorrect?
Option 1: Fifth Five-Year Plan - 1961-66
Option 2: Eighth Five Year Plan - 1992-97
Option 3: Eleventh Five Year Plan - 2007-12
Option 4: First Five-Year Plan - 1951-56
Question : What is the minimum age required to become a member of Rajya Sabha?
Option 1: Twenty years
Option 2: Thirty years
Option 3: Twenty two years
Option 4: Twenty five years
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile