how many words , with or without meaning , can be formed using all letters of the word orange using each letter exactly once ?
"the word orange has exactly 6 letters which are all different . therefore the number of words that can be formed = number of permutations of 6 letters taken all at a time . = p ( 6 , 6 ) = 6 ! = 6 × 5 x 4 x 3 x 2 × 1 = 720 answer : b"
factorial(const_3)