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How many ways can 5 letters be chosen from the set if order is important and no repeats are allowed?
It depends on the number of letters in the set - which is not specified. If there are n different letters in the set, the answer is n*(n-1)*(n-2)*(n-3)*(n-4)
What is the meaning of intersection set?
If I'm correct in interpreting what you're asking, the intersection set is the set between two sets that contains the common elements (denoted by what looks almost like a large lowercase n). In other words, if: set A = {1,2,3,7,8,9} and set B = {2,3,6,8,9,10) then the intersection set (A n B) = {2,3,8,9}. Just take what the two sets have in common, and put them together (don't repeat the digits, just what's in common).
What is the meaning of n a?
Not applicable
What is the difference between a finite set and an infinite set?
Set A is a finite set if n(A) =0 (that is, A is the empty set) or n(A) is a natural number. A set whose cardinality is not 0 or a natural number is called an infinite set.
How do you find the set of consecutive numbers?
N, N+1, N+2, N+3, etc.
