- A41
- B49
- C45
- D90
Step-by-Step Solution
For first digit a (1-9) and last digit c (0-9) with middle a + c <= 9: count pairs. For a=1: c=0..8 (9); a=2: 8; ... a=9: 1. Sum 9+8+7+6+5+4+3+2+1 = 45.
Answer: C) 45
275 is a three-digit number where the sum of the first and last digits equals the middle digit (2 + 5 = 7).
How many three-digit numbers have this property?
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