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  4. The number of subsets of the power set of set A= 7,10,11 is

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Q. The number of subsets of the power set of set $A=\{7,10,11\}$ is

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Solution:

$P(A)=\{\phi,\{7\},\{10\},\{11\},\{7,10\},\{7,11\},\{10,11\},\{7,10,11\}\}$
Number of subsets $=2^n=2^8=256$