Question

how many 3 digit no can be formed from 0,1,3,5,6 if repeatatios is not allowed?

Answer 1

3 digit no. formed from 0,1,3,5,6 are following as:-

103, 130, 310,301, 105,150, 501, 510, 610, 601, 106, 135, 136, 153, 513, 315, 653, 635, 356, etc. there are many more no. that can be formed from these no..

Answer 2

Number of choices for 1st digit = 4 (excluding zero)

Number of choices for 2nd digit = 4 (any digit not taken up by the first digit)

Number of choices for 3rd digit = 3 (any digit not taken up by the first two digits)

Total number of possible combination = 4 x 4 x 3 = 48

Answer: There are a possible of 48 3-digit numbers.