Indicate the formula for the following conditions. c(n, r)

Step-by-step explanation:

Definition: A combination is a collection or set of the elements such that the order of the arrangement of elements doesn't matter. It is a common technique to find the total number of combinations of elements present in an event . It is denoted by C(n,r) .

The formula for the number of combinations of n things taken r at a time is given by :-

answer: all of the odd numbers were opened

the first person was the one that was opening all of the lockers. since one is odd, this causes all of the odd number lockers to be opened in the end.