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Grade 12th passIIT JEE Entrance Exam

if the number of ways of selecting n cards out of unlimited number of cards bearing the numberr 0,9,3, so that they cannot be used to write the number 903 is 93, then n is equal to ?

Profile image of satyam sahu
9 Years agoGrade 12th pass
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1 Answer

Profile image of ajay
9 Years ago
formula to find the term is
3(2^n-1)=93
2^n-1-=31
2^n=32
2^n=2^5
n=5
so you will get required answer 5
 

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