WAEC - Further Mathematics (2020 - No. 25)
In how many ways can the letters of the word MEMBER be arranged?
720
360
180
90
คำอธิบาย
No. of ways = \(\frac{6!}{2!2!}\)
= \(\frac{6 \times 5 \times 4 \times 3 \times 2!}{2 \times 1 \times 2!}\)
= 180 ways