We have 7770 balls available, and there is 1 ball on d top of rack and then 3 balls on d 1st floor behind the top rack (horizontal rack) and then 6 balls on 2nd floor then 10 balls on 3rd floor,
How many floors can be accomdated with the given no of balls...???

Solve it folks n post uah answers

Optns
36 35 34 33

• 1+3+6+10+........=7770 sum of triangular number
  n*(n+1)*(n+2)/6 gives 35
• 8 years agoHelpfull: Yes(6) No(4)
• 35 bcz 7770 is perfectly divisible by 35.
• 8 years agoHelpfull: Yes(5) No(4)
• use hit and trial method and get the solution:-
  [n*(1+x)]/2=7770
  put n=36,35,34 and 33
  then see which is divisible 7770.
  
  ex:
  [35*(1+x)]/2=7770
  =>1+x=(7770*2)/35
  =>1+x=444
  =>x=443.
  that is 35 is the answer.
• 6 years agoHelpfull: Yes(0) No(0)