Q. $\sum_{n = 1}^{10}{\sum_{i = 1}^{n - 1}1}$is equal to
A) $n + 10$
B) 10$n$
C) 55
D) 45
Explanation
The correct answer is Option D: 45.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.