Question on: JAMB Mathematics - 2022
In how many ways can the letter of ZOOLOGY be arranged?
A
720
B
360
C
840
D
120
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Correct Option: C
ZOOLOGY has 7 letters in total, with O repeated thrice hence,
\(\frac{7!}{3!}\) → \(\frac{7*6*5*4*3*2*1}{3*2*1}\)
= 840ways
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