Question

The probability of forming a five digit number using the digits of the decimal system which reads alike from left to right and right to left is

• A. $0.02$
• B. $0.01$
• C. $0.03$
• D. $0.2$

Answer 1

The correct option is B $0.01$

To make such number first digit cannot be zero and if we assume the first three digits then fourth, fifth digits are fixed accordingly
Therefore, no. of such possibilities $=9\ast 10\ast 10$
Total $5$ digits numbers $=9\ast 10\ast 10\ast 10\ast 10$
$\Rightarrow P=900/90000=0.01$