a) 40320
b) 10080
c) 20160
d) 64
Answer: c
Explanation: The given words contains 8 letters of which E is taken 2 times.
∴ Required number of ways
$$\eqalign{
& = \frac{{8!}}{{2!}} \cr
& = \frac{{8 \times 7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1}}{2} \cr
& = 20160 \cr} $$
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