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Two numbers x and y are selected from a set A={1,2,3,......,20}.What is the probability that the number x^2 - y^2 is divisible by 4?

Two numbers x and y are selected from a set A={1,2,3,......,20}.What is the probability that the number x^2 - y^2 is divisible by 4?





 

Grade:12

2 Answers

G Narayana Raju
51 Points
9 years ago

10C2 x2/20C2

anusha pal
14 Points
9 years ago

can u pls explain the concept of ths question???

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