If x @ y = x + y - xy, then 13 @ 7 = __

-71

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Solution

The correct option is A
-71

Given, x @ y = x + y - xy

Therefore, x = 13 and y = 7.

13 @ 7

= 13 + 7 - (13 $\times$ 7)

= 20 - 91

(since 91 > 20, the result of 20 - 19 will be negative)

= - (91 - 20)

= -71

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