Find the number of different possible arrangements of the 9 letters in the word CELESTIAL. ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................

Mathematics

IGCSE&ALevel

CAIE

Exam No：9709_s20_qp_53 Year：2020 Question No：7(a)

Answer:

\(\frac{9 !}{2 ! 2 !}=90720\)

5.2.2.1 repetition (e.g. the number of ways of arranging the letters of the word ‘NEEDLESS’)