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13. There r ten spots in library and each spot has
6 tables and
each has ten chairs. 10 student come into
liberary and want 2 study. in 1st table only
person, and in 2nd table 2 persons and so on....
finally how many tables would be blank?

Read Solution (Total 2)

10 spots* 6 tables=60 tables
1 person 1 st table
2 person 2 nd table
3 person 3 nd table
4 person 4 nd table
--------------------
10 students
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so nof tables left blank is 60-4=56
12 years agoHelpfull: Yes(33) No(10)

Nagarjun is right
12 years agoHelpfull: Yes(7) No(2)

TCS Other Question

IN how many ways we can distribute 10 identical looking pencils to 4 students so that each student get at least one pencil?
a)5040
b)210
c)84
d)none of these a drawer holds 4 red hats and 4 blue hats.what is the probability of getting exactly three red hats or exactly three blue hats when taking out 4 hats randomly out of the drawer and immediatly returning every hat to the drawer before taking out the next?
a)1/2
b)3/8
c)1/4
d)1/8