What is the product of the average of first ten positive odd numbers and the average of first fifteen positive even numbers ?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 160
The average of the first n natural odd numbers = n2/n {where n = total terms}
The average of first 10 odd positive numbers = 102/10 = 10
The average of the first n natural even numbers = n(n +1)/n = n + 1
The average of first fifteen positive even numbers = 15 + 1 = 16
So, the required product = 10 × 16 = 160