imo class 12 probability

A fair coin is tossed 7 times. Probability of exactly 2 heads is:

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A fair coin is tossed 7 times. Probability of exactly 2 heads is:

  • A. 21/128
  • B. 35/128
  • C. 7/128
  • D. 42/128

Answer: A) 21/128

Explanation: ⁷C₂(1/2)⁷=21/128.

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