Dialling a telephone number to his daughter an old man forgets the last three digits and dialled at random remembering only that they are same.The probability that the number dialled is correct is
A
1720
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B
110
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C
1103
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D
1135
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Solution
The correct option is B110 Total cases =10=[0,0,01,1,12,2,23,3,3.....10,10,10] Correct case =1 The required probability=1/10