1.

Consider a set P consisting of 5 elements . A sub set .A. of P is chosen thereafter set .P. is reconstructed and finally another sub set .B. is chosen from P. The number of ways of choosing .A. and .B. such that (A cup B) ne P is :

Answer»

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Solution :TOTAL no. of WAYS by which subsetsA and B can be formed `=4^5`
Total no. of ways by which subsets A and B can be formed such that `A uu B = P ` is `3^5`
`THEREFORE ` REQUIRED answer is `4^5- 3^5`


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