IIM-B (BBA-DBE) 2025 #1Modern Math > Hard13!40\frac{13!}{40}4013!13!5!8!\frac{13!}{5!8!}5!8!13!13!4!7!\frac{13!}{4!7!}4!7!13!13!80\frac{13!}{80}8013!✅ Correct Option: 1Related questions:A rabbit is sitting at the base of a staircase which has 10 steps. It proceeds to the top of the staircase by climbing either one step at a time or two steps at a time. The number of ways it can reach the top isThe total number of positive integer solutions of 21≤a+b+c≤2521 ≤ a + b + c ≤ 2521≤a+b+c≤25 isThere are 5 parallel lines on the plane. On the same plane, there are nnn other lines that are perpendicular to the 5 parallel lines. If the number of distinct rectangles formed by these lines is 360, what is the value of nnn?