Question 1174544
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Hi
 {{{P (x)= highlight_green(nCx)(p^x)(q)^(n-x) }}} Binomial Theorem
       N = 3 coins tossed               p(H)=1/2   and q(T)=1/2 

 P(x ≤ 2) = P(x=0) + P(x=1) + P(x=2)
P(x=0) + P(x=1) + P(x=2) = 3C0(1/2^)3 + 3C1(1/2)^3 + 3C2(1/2)^3 
     (1/8) + (3/8) + (3/8)  = .875

  P(x < 5) = 1   
 NOte: P(x=0) + P(x=1) + P(x=2) + P(x=3) = .875 + .125 = 1

Wish You the Best in your Studies.
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