||'''Book'''|| Advanced Engineering Mathematics ||
 ||'''Author'''|| Erwin Kreyszig ||
 ||'''Edition'''|| 8th Edition ||



{{{
def f(r):
    n=4
    p=1/6
    q=5/6
    val=factorial(n)/(factorial(n-r)*factorial(r))
    val1=p**r
    val2=q**(n-r)
    return val*val1*val2
  
p=f(2)+f(3)+f(4)
print p*100}}}


 * '''Solution by''': 
S.K.Manoj, Student, IIIT Hyderabad