১-১০০ পর্যন্ত লিখতে ৯ সংখ্যাটি কতবার আসে ? 

9 comes 20 times between 1 and 100. Let’s see how-

1, 2, 3, 4, 5, 6, 7, 8, 9, 10.

11, 12, 13, 14, 15, 16, 17, 18, 19, 20.

21, 22, 23, 24, 25, 26, 27, 28, 29, 30.

31, 32, 33, 34, 35, 36, 37, 38, 39, 40.

41, 42, 43, 44, 45, 46, 47, 48, 49, 50.

51, 52, 53, 54, 55, 56, 57, 58, 59, 60.

61, 62, 63, 64, 65, 66, 67, 68, 69, 70.

71, 72, 73, 74, 75, 76, 77, 78, 79, 80.

81, 82, 83, 84, 85, 86, 87, 88, 89, 90.

91, 92, 93, 94, 95, 96, 97, 98, 99, 100.