SOLUTION:
·To find the number of ways you arrange the letters of the word REFERENCE,we'll use the formula for distinguishable permutation.
·Since there are 9 letters in total and letter E has been used four times while R has been used twice,our given will be n= 9,p=4 and q= 2.
ANSWER:
·Thus,there are 7,560 distinguishable permutations of the letters in the word REFERENCE.
