Question 40

If 18!10 = 4, 10!4 = 3 and 4!8 = -2, then ﬁnd the value of 16!18 = ?

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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