Question: How many different 4-letter permutations can be formed from the letters in the word 'united'?
A ) 720 B ) 360 C ) 15 D ) 24
Steps to derive
1 The arrangement of n objects in a specific order using r objects at a time is called a permutation of n objects taking r objects at a time. It is written as nPr, and the formula is
nPr = n!(n-r)!
