- A7
- B8
- C9
- D10
Step-by-Step Solution
First digit can be 1 to 8 (middle = first + 1 must stay a single digit no more than 9, and first at least 1). That gives 1,2,...,8, so 8 numbers.
Answer: B) 8
Numbers like 121, 232 and 343 are three-digit numbers where the first and last digits are equal and the middle digit is one more than them.
For example 1_1 with middle 2, 2_2 with middle 3.
How many such three-digit numbers are there?
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