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1.How many times does the digit 7 occurs if we write all the numbers from1 to 200?

Answer»

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, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200The highlighted numbers are in which digit 7 occurs.

Now, let us write all the numbers which have the digit 7 in them between 1 to 200.

These numbers are as follows.

Number Number of times digit 7 occurs in it

7 1 17 1 27 1 37 1 47 1 57 1 67 1 70 1 71 1 72 1 73 1 74 1 75 1 76 1 77 2 78 1 79 1 87 1 97 1 107 1 117 1 127 1 137 1 147 1 157 1 167 1 170 1 171 1 172 1 173 1 174 1 175 1 176 1 177 2 178 1 179 1 187 1 197 1 _______ 40 _______

So, from 1 to 200, the digit 7 occurs 40 times

40 is the correct answer.

40 is the best answer

40 is the right answer



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