- A6
- B8
- C9
- D10
Step-by-Step Solution
A two-digit number plus its reverse . This equals 99 when . With a, from 1 to 9 (both non-zero): (1,8),(2,7),(3,6),(4,5),(5,4),(6,3),(7,2),(8,1) = 8 numbers.
Answer: B) 8
Two-digit numbers like 18 and 81 are reverses of each other. Aman writes a two-digit number and its reverse, then adds them.
For how many two-digit numbers (with both digits non-zero) is this sum equal to 99?
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