The expression 3P2 can also be read as "permutation of 3 taken 2". This represents the number of ways in which the 3 items are arranged with the emphasis on the arrangement of the first two other items.
Answer:
18
Step-by-step explanation:
18
10 tests = x tests
/ 5 weeks = / 9 weeks
10* 9= x5
90/5= 18