How many times does 5 appear in all two-digit positive integers?

उत्तर दाखवा आणि स्पष्टीकरण

उत्तर: (B) 19

स्पष्टीकरण

Tens place: 50-59 = 10 times. Units place: 15, 25, ..., 95 = 9 times. Total 19.