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Dhaka Higher Secondary 2011/1

Posted: Wed Jan 11, 2012 10:01 am
by Eesha
In a box there are 50 gold rings of 10 different sizes and 75 silver rings of 12
different sizes. The size of a gold ring might be the same as that of a silver ring.
What is the minimum number of rings one need to pick up to be sure of having at
least two rings different both in size and material?

এটার উত্তর কেন ৭৬টা না???

কারণ ৭৫টা তুললে তার ৭৫টাই রুপার হউয়া সম্ভব...

Re: Dhaka Higher Secondary 2011/1

Posted: Wed Jan 11, 2012 10:04 am
by Eesha
এইটার উত্তরতো আরও বেশী(৭৬+) হওয়ার কথা।

Re: Dhaka Higher Secondary 2011/1

Posted: Wed Jan 11, 2012 12:57 pm
by Tahmid Hasan
এইটা আগেও পোস্ট হয়েছে,
যাই হউক উত্তর $41+64+1=106$

Re: Dhaka Higher Secondary 2011/1

Posted: Wed Jan 11, 2012 3:21 pm
by Moon
Try to search before posting: viewtopic.php?f=41&t=472
Also most of the divisional problems are nicely categorized in those sub forums: viewforum.php?f=41