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If set P has 4 elements and set Q has 5 elements then find the number of elements in P X Q.(a) 9(b) 4^5(c) 20(d) 5^4I got this question in a job interview.The question is from Cartesian Product of Sets topic in portion Relations and Functions of Mathematics – Class 11

Answer» RIGHT option is (C) 20

For explanation I WOULD say: If SET P has m elements and set Q has n elements then P X Q has m*n elements.

Here, m=4 and n=5 therefore P X Q has 4*5=20 elements.


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