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each of the 2 friends has 20 stamps and 10 postcards.we can an exchange fair if they exchange a stamp fi=or a stamp or post card for a post card.how many ways are there to carry out one fair exchange b/w 2 friends
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- 20*20 +10*10= 500 ways
- 12 years agoHelpfull: Yes(18) No(4)
- please send this answer..
- 12 years agoHelpfull: Yes(1) No(0)
- @SHIKHA-plz explain....how 500???
- 12 years agoHelpfull: Yes(0) No(3)
- (20C2 +10c2)*2!=235
- 12 years agoHelpfull: Yes(0) No(5)
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