There are 13 stations on a certain railway line. How many kinds of different single third class tickets have to be printed in order that it may be positive to travel from any station to any other.
Add an Answer
More Questions From This User See All
Answers & Comments
Answer:
13
Step-by-step explanation:
first apply the formula of combination and then solve it
Answer:
answer is 13
Please mark in branillyyyy..