n digits positive integer's formed such that each digit is 1 2 or 3 . How many of these contain all three of the digits 1 2. 3 at least once Share with your friends Share 2 Saurabh Gupta answered this 3(n-1) -14 View Full Answer Saurabh Gupta answered this 3^n-3.2^n+3 -18 Femi P J answered this Total n digits using 1,2,3=3^n. Total n digit numbers using any 2digits=3C2*2^n-6=3* 2^n-6. Total n digit numbers using one digit=3. Required answer=3^n-3*2^n+3 -5
