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The counter shows 3,49,99,999 visitors. After one more visitor it shows:

A3,49,99,998
B3,59,99,999
C3,50,00,000
D3,50,99,999
Answer & Solution
Correct answer: C. 3,50,00,000
Adding 1 carries through every 9, giving 3,50,00,000.
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