In how many ways can the letter of ZOOLOGY be arranged?
- 720
- 360
-
840
- 120
The correct answer is: C
Explanation
Zoology has 7 letters in total, with O repeated thrice
\(\frac{7!}{3!}\) → \(\frac{7*6*5*4*3*2*1}{3*2*1}\)
= 840ways
There is an explanation video available .