TCS Company General Ability General Knowledge

a person starts writing all 4 digits numbers.how many times had he written the digit 2??

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TCS Other Question

how many numbers from 283 to 839 have digit 7 in it?? a petri dish hosts a healthy colony of bacteria.once a minute every bacterium divides into two.the colony was founded by a single cell at noon.at exactly 12.43(43 minutes later) the petri dish was half full.at what time the dish will be full?