Question

nos of 2 digit nos that can be formed using the digits 0,1,2 asuming no digits r repeated

Answer 1

In a two digit number 0 can not appear in the ten's place. So ten's place can be filled in two ways.(viz. 1, 2). Since repetition of digit is not allowed and 0 can be used at one's place, so one's place can be filled in two ways.

Hence required number of numbers = 2 × 2 = 4