1isse to sets ke principle se solve karna hai
In a college of 300 students, every student reads 5 newspapers and every newspaper is read by 60 students. The number of newspapers is :
a. At least 30
b. At most 20
c. Exactly 25
d. None of the above
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11 Answers
49is the question that except the 60 students the other students read exactly 5 newspapers or at least 5 newspapers??
in neither case is the answer at most 20....nor exactly 25 nor at least 30....
for example, the min no of newspaper is 6...240 students read any five of the 6 newspaper and rest 60 read all 6...
then max no of newspaper can be achieved if all student reads 5 newspaper each and all 5 newspaper is different from the ones read by other...
so max no of newspaper is 1200...
thus answer is none of this.....[1][1][1]
though i wrote this answer i am not satisfied with this answer.....so someone please contradict...
23we r asked abt no of diff types of papers right???
i m not sure , but is it 25 ??? i.e option c ?
23Every students reads 5 types of news papers. In all there are 300 students .
So in all , u will need to supply a total of 1500 newspapers to the college. .......(1)
Now suppose there are ' x ' types of newspapers , and each type is read by 60 students .
Hence total newspapers that we will need to supply to the college is 60x........ (2)
from 1 and 2 ,
60x = 1500
hence x = 25
is it correct ??
49sorry all of you.....my reasoning is wrong in this problem....i was talking of the problem in which a group of 60 students reads all the newspapers that comes to the school and the rest read 5 news papers each....just my fault...faulty perception...
