Solution
Given : 18!10 = 4, 10!4 = 3 and 4!8 = -2
If we replace '!' with '-', and divide the difference by 2, we get the desired result.
Eg :- $$\frac{18-10}{2}=4$$
and $$\frac{10-4}{2}=3$$ and $$\frac{4-8}{2}=-2$$
Similarly, $$\frac{16-18}{2}=-1$$
=> Ans - (B)
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