| Column A | Column B |
The length of AB | 7 |
Solution for GRE Math Problem 38:
How many three-digit numbers are?
The first digit can be any of 9, the second - any of 10, so does the third. Total 9x10x10=900 combinations.
How many three-digit palindromes are?
The first digit can be any of 9, the second - any of 10, and the third one must be exactly the same as the first, thus, leaving only 1 possibility. Total 9x10x1=90.
The probability that a three-digit number chosen at random is a palindrome is 90x900=0.1
Answer: C
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