Assume that you have just heard of a scandal and you are the
first one to know. You pass it on to
four person in a matter of 30 minutes. Each of these four in
turn passes it to four other persons
in the next 30 minutes and so on.
How long it will take for everybody in the World to get to
know the scandal?
Answer Posted / arvind ragunathan
the sum goes out this way : 4+4^2+.....4^11 to reach 5.6
billion. the 30 minutes count starts with 5 people. so
there are 10 '30 minutes' in this sum. that amounts to 300
minutes. hence 5 hours.
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