A coin is tossed 4 ttimes. probability of getting heads exactly in 3 times
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1/8..............................
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n=4
x= 3
p(x)= ncx p^x q^n-x
= 4c3 p^3 q^(4-3)
p = 1/2 (probability of getting head)
q = 1 - p = 1/2
p(x) = 4c3 (1/2)^3 (1/2)^1
=(4×3×2×1)÷(1×2×3) (1/8) (1/2)
=4/16
ans =1/4
x= 3
p(x)= ncx p^x q^n-x
= 4c3 p^3 q^(4-3)
p = 1/2 (probability of getting head)
q = 1 - p = 1/2
p(x) = 4c3 (1/2)^3 (1/2)^1
=(4×3×2×1)÷(1×2×3) (1/8) (1/2)
=4/16
ans =1/4
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