Question

how many times does the digit 7 occurs if we write all the number from 1 to 200?​

Answer 1

Answer:

20

Step-by-step explanation:1st hundred:10

2nd hundred:10

10+10=20

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Answer 2

Answer:

Hi ,

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*

Range : * numbers which have digit 7 * no. of 7 's

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1 to 100 * 7,17 ,27 ,37 ,47 ,57 , 67 , 70 ,71 ,72 ,73 ,74 ,75 ,* 20

76 ,77, 78 , 79 , 87 ,97

2 to 200 * 107 , 117 ,127 ,137 ,147, 157 ,167 ,170 ,171 , 172 , * 20

173 ,174 , 175 , 176 ,177 ,178 ,179 , 187 , 197

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Total number of 7 's occur from 1 to 200 = 40

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Step-by-step explanation:

2time for brief explanation

Solution :-

Let us write all the numbers from 1 to 200.

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, 200

The 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

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40

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

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