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1 . If the result obtained by multiplying a number x by a number 1 less itself is 4 less than multiplying x by itself, then x =?

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Answer: Option A

Explanation:

The given information can be represented as:

X * (X - 1) = X^2 - 4

Now, since it is mentioned that the result obtained by multiplying X by a number 1 less than itself is 4 less than multiplying X by itself,

we can set up the equation:

X * (X - 1) = X * X - 4

or, X^2 - X = X^2 - 4

or, -X = -4

So, X = 4