संख्या 1 से 100 तक के बीच संख्या 5 कितनी बार आती है? A. 21 B. 22 C. 20 D. 19

Count the 5s in the units place: 5, 15, 25, …, 95 gives 10. Count the 5s in the tens place: 50, 51, …, 59 gives another 10. (55 is counted once in each list because it contains two 5s.) Total = 10 + 10 = 20.