In the reading room of a library, there are 23 reading spots. Each reading spot
consists of a round table with 9 chairs placed around it. There are some readers such
that in each occupied reading spot there are different numbers of readers. If in all there
are 36 readers, how many reading spots do not have even a single reader?
a) 8 b) none c) 16 d)15

• d) 15
  1+2+3+4+5+6+7+8 = 36
  so, 8 spots are occupied by users
  
  23-8 = 15, spots do not have even a single reader.
• 9 years agoHelpfull: Yes(15) No(2)
• 9+8+7+6+5+1 = 36
  23-6(Occupied) = 17 spots do not have even single reader.
• 8 years agoHelpfull: Yes(3) No(0)
• can not be determined,coz it is not given whether no. of spots to be filled is maximum or minnimum
• 8 years agoHelpfull: Yes(2) No(0)
• none. answer is 17
• 9 years agoHelpfull: Yes(1) No(0)
• case 1
  10 is fix than total case would be possibel 1*1*8*7=56
  case 2
  120 if fix than total possibility=1*1*1*7 =7 (7=remaining digit)
  case 3
  fix 123
  total possible=1*1*1*7=7
  
  tatal case=56+7+7=70
• 8 years agoHelpfull: Yes(1) No(3)
• As ,There are some readers such that in each
  occupied reading spot there are different numbers of
  readers.
  1+2+3+4+5+6+7+8= 36 readers
  
  so ,8 spots have different readers.
  remainings are 23-8= 15.
  
  15 spots are empty.
• 8 years agoHelpfull: Yes(1) No(0)
• 1+2+3+6+7+8+9=36.This means 7 spots are there that have readers.So 23-7=16 spots are there that have no readers.
• 8 years agoHelpfull: Yes(0) No(1)
• Answer can be c)16 also
  
  As 9+8+7+6+3+2+1=36
  
  Total 7case
  So 23-7=16
• 8 years agoHelpfull: Yes(0) No(0)