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1. If A = { 1,2,3,4,5} , then the number of proper subsets of A is -

  • A. 120
  • B. 120
  • C. 120
  • D. 120

Answer: Option C

Explanation:

আমরা জানি, Proper subset সংখ্যা = 2n-1এখানে, n = 5  proper subset সংখ্যা = 25-1=32-1=31

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