A person starts typing the numebrs from 1 to 1999. He press the keys total 'n' number of times. The value of n is:
A
6889
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B
1000
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C
2888
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D
None of these
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Solution
The correct option is A 6889 The number of times he pressed the keys for one digit number = 9 The number of times he pressed the keys for two digit number = 90 × 2 = 180 The number of times he pressed the keys for three digit number = 900 × 3 = 2700 The number of times he pressed the keys for the number 1000 to 1999 is 1000 × 4 = 4000 The total number of times the keys are pressed = 6889