In how many ways can the letter of ZOOLOGY be arranged?
In how many ways can the letter of ZOOLOGY be arranged?
720
360
840
120
Correct answer is C
Zoology has 7 letters in total, with O repeated thrice
7!3! → 7∗6∗5∗4∗3∗2∗13∗2∗1
= 840ways
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