`n` whole are randomly chosen and multiplied
Column I, Column II
The probability that the last digit is 1,3,7, or 9 is, p. `(8^n-4^n)/(10^n)`
The probability that the last digit is 2,4,6, or 8 is, q. `(5^n-4^n)/(10^n)`
The probability that the last digit is 5 is, r. `(4^n)/(10^n)`
The probability that the last digit is zero is, s. `(10^n-8^n-5^n+4^n)/(10^n)`