How many words, with or without meaning, can be formed using all letters of the word RED using each letter exactly once?
Choose the correct choice from the following:
A) 6
B) 7
C) 8
D) 9
E) 10

Rationale: the word red has exactly 3 letters which are all different . therefore the number of words that can be formed = number of permutations of 3 letters taken all at a time . = p ( 3 , 3 ) = 3 ! = 3 x 2 × 1 = 6 answer : a
Answer: A