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Q.
If the sum and diference of two numbers are 20 and 8 respectively, then the difference of their squares is :
A.
120
B.
140
C.
160
D.
180
View Answer
Correct choice: C
Explanation:
Let the numbers be x and y. Then, x + y = 20 and x - y = 8. x^2 - y^2 = (x + y) (x - y) = 20 x 8 = 160.
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