What is the possibility of getting at least 6 heads, if

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What is the possibility of getting at least 6 heads, if eight coins are tossed simultaneously ?

1. 37/256
2. 25/57
3. 1/13
4. None of these

Correct Option: A

Required probability = Probability of getting 2 tails + Probability of getting 1 tail + Probability of getting no tail.
= ⁸C₂ x 1/256 + ⁸C₁ x 1/256 + ⁸C₀ x 1/256
= 37/256