def intervalle_fluctuation(alpha,n,p):
    a = 0
    s = binomFdp(n,p,a)
    while s<alpha/2:
        a+=1
        s+=binomFdp(n,p,a)
    b = a
    while s<1-alpha/2:
        b+=1
        s+=binomFdp(n,p,b)
    return [a,b]