Question : Find the average of the cubes of the first five natural numbers.
Option 1: 35
Option 2: 40
Option 3: 45
Option 4: 50
Latest: SSC CGL preparation tips to crack the exam
Don't Miss: SSC CGL complete guide
New: Unlock 10% OFF on PTE Academic. Use Code: 'C360SPL10'
Correct Answer: 45
Solution : Average of the cubes of the first $n$ natural numbers = $\frac{n(n+1)^2}{4}$ Here, $n$ = 5 So, the average of the cubes of the first five natural numbers = $\frac{5(5+1)^2}{4}$ = $\frac{5×36}{4}$ = $45$ Hence, the correct answer is 45.
Candidates can download this ebook to know all about SSC CGL.
Admit Card | Eligibility | Application | Selection Process | Preparation Tips | Result | Answer Key
Question : The average of five positive numbers is 56. If the first number is three-fourths of the sum of the last four numbers, then the average of the last four numbers is:
Question : The average of two numbers is 8, and the average of the other three numbers is 3. The average of the five numbers is:
Question : Of the three numbers whose average is 40, the first is $\frac{1}{3}$rd of the sum of the other two. What is the first number?
Question : The cube of the difference between two given natural numbers is 1728, while the product of these two given numbers is 108. Find the sum of the cubes of these two given numbers.
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile