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Rangpur Higher Secondary 2011/1

Posted: Wed Feb 02, 2011 9:05 pm
by BdMO
Problem 1:
After tossing some coins, it is observed that the probability of obtaining $10$ heads and $15$ tails is the same as the probability of obtaining $15$ heads and $10$ tails. Find the least number of coins tossed.

Re: Rangpur Higher Secondary 2011/1

Posted: Tue Feb 15, 2011 7:41 pm
by Moon
$25$