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Ask iit jee aieee pet cbse icse state board community Discussion Response Post to: SOLVED~~~5 TRICKY PROBLEMs FROM "PERMUTATIONS AND COMBINATIONS"...HURRY!
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[Post New]25 Jun 2007 10:09:55 IST
    Subject: Re:5 TRICKY PROBLEMS FROM "PERMUTATIONS AND COMBINATIONS"...HURRY!
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lazycol (711)

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Olaaa!! Perrrfect answer. 121  [174 rates]
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each prediction can b either correct or wrong
a prediction can b correct only in 1 way,wrong in 2 ways
2 make 5 correct & 5 wrongs
select 5 correct out of 10 predictions = 10C5
no:of ways = 10C5 * 2^5(wrong can b in 2 ways)
 
 
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