Without repetition of the numbers, four digit numbers are formed with the numbers 0, 2, 3, 5. The probability of such a number divisible by 5 is
A. $\frac{1}{5}$
B. $\frac{4}{5}$
C. $\frac{1}{30}$
D. $\frac{5}{9}$
D. 5/9
Explanation:
We have digits $0,2,3,5$.
We know that, if unit place digit is ' 0 ' or ' 5 ' then the number is divisible by 5 If unit place is ' 0 '
Then first three places can be filled in $3 !$ ways $=3 \times 2 \times 1 \times 1=6$ If unit place is ' 5 '
Then first place can be filled in two ways and second and third place can be filled in $2 !$ ways $=2 \times 2 \times 1 \times 1=4$
$\therefore$ Total number of ways $=6+4=10=\mathrm{n}(\mathrm{E})$
Total number of ways of arranging the digits $0,2,3,5$ to form 4 - digit
numbers without repetition is $3 \times 3 \times 2 \times 1=18$
Probability $=\frac{\text { Number of favourable outcomes }}{\text { Total number of outcomes }}$
$\therefore$ Required probability $=\frac{10}{18}=\frac{5}{9}$
Hence, the correct option is (D).