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Grade: 12

                        

Let A and B be two sets each containing three elements then sum of digit in number of subsets of A×B , each having at least two and at most 7 elements, is equal to?

3 years ago

Answers : (1)

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137 Points
							Total subsets are 2^9 - {9C0 + 9C1 +9C8 + 9C9}= 492. Therefore sum of digit in number of subsets of A×B is 4+9+2=15
						
3 years ago
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