sherlock homes and dr. watson have to travel from rajiv gandhi chowk to indira gandhi
internation airport via the metro they have enough coins of 1,5,10,25 pasie.shelock
homes agrees to pay for dr.watson,only if he tells all the possible combination of coins
that can be used to pay for the ticket.

1. how many combinations are possible,if the F are is 50 paise?
(a)52 (b)49 (c)45 (d)44

2. how many combination are possible,if they get an international dignilary discount of 10%,
i.e. the fareis 45 paise?
(a)45 (b)44 (c)39 (d)36

• Ans=49
  1p 25p 1
  1p 5p 9
  1p 10p 4
  5p 10p 4
  5p 25p 1
  1p 5p 10p 4+3+3+2+2+1+1=16
  1p 5p 25p 4
  1p 10p 25p 2
  5p 10p 25p 2
  1p 10p 25p 5p 2
  1p 1
  5p 1
  10p 1
  25p 1
• 9 years agoHelpfull: Yes(3) No(4)
• Arrange the combinations of the coins in the decreasing order of denominations :
  Case 1: when there is 2 25pc coin - 1 ways
  Case 2: when there is 1 25pc coin and
  (1) 2 10pc coin - nos of 5pc coin will range from 1 to 0 i.e 2 combinations
  (2) 1 10pc coin - nos of 5pc coin will range from 3 to 0 i.e 4 combinations
  (3) 0 10pc coin - nos of 5pc coin will range from 5 to 0 i.e 6 combinations
  Case 3: when there is no 25 pc coins and
  (1) 5 10pc coin - 1 ways
  (2) 4 10pc coin - nos of 5pc coin will range from 2 to 0 i.e 3 combinations
  (3) 3 10pc coin - nos of 5pc coin will range from 4 to 0 i.e 5 combinations
  (4) 2 10pc coin - nos of 5pc coin will range from 6 to 0 i.e 7 combinations
  (5) 1 10pc coin - nos of 5pc coin will range from 8 to 0 i.e 9 combinations
  (6) 0 10pc coin - nos of 5pc coin will range from 10 to 0 i.e 11 combinations
  So a total 49 different combinations.
  
  
  
  
  
  q2
  
  
  Again arrange the coins in decreasing order of denominations:
  
  Case 1: when there is 1 25pc coin and
  (1) 2 10pc coin - 1 ways
  (2) 1 10pc coin - nos of 5pc coin will range from 2 to 0 i.e 3 combinations
  (3) 0 10pc coin - nos of 5pc coin will range from 4 to 0 i.e 5 combinations
  
  Case 3: when there is no 25 pc coins and
  (1) 4 10pc coin - nos of 5pc coin will range from 1 to 0 i.e 2 combinations
  (2) 3 10pc coin - nos of 5pc coin will range from 3 to 0 i.e 4 combinations
  (3) 2 10pc coin - nos of 5pc coin will range from 5 to 0 i.e 6 combinations
  (4) 1 10pc coin - nos of 5pc coin will range from 7 to 0 i.e 8 combinations
  (5) 0 10pc coin - nos of 5pc coin will range from 9 to 0 i.e 10 combinations
  
  So total different combinations = 39
• 7 years agoHelpfull: Yes(3) No(0)
• let us make possible combination
  ans=49
  possible combination-
  coins used total possible combinations
  1p 25p- 1
  1p 5p 9
  1p 10p 4
  5p 10p 4
  5p 25p 1
  1p 5p 10p 4+3+3+2+2+1+1=16
  1p 5p 25p 5
  1p 10p 25p 2
  5p 10p 25p 2
  1p 10p 25p 5p 1
  1p 1
  5p 1
  10p 1
  25p 1
• 9 years agoHelpfull: Yes(1) No(0)
• Can anyone please explain it in a better way with a better explanation?
• 9 years agoHelpfull: Yes(1) No(1)
• 49 is not in the option
• 9 years agoHelpfull: Yes(1) No(4)
• let us make possible combination
  ans=49
  possible combination-
  coins used total possible combinations
  1p 25p- 1
  1p 5p 9
  1p 10p 4
  5p 10p 4
  5p 25p 1
  1p 5p 10p 4+3+3+2+2+1+1=16
  1p 5p 25p 5
  1p 10p 25p 2
  5p 10p 25p 2
  1p 10p 25p 5p 1
  1p 1
  5p 1
  10p 1
  25p 1
  
  
  hence adding all we have 49 combinations
  
• 9 years agoHelpfull: Yes(0) No(3)
• Could any one explain how this question solved? I am not getting how combination made.
• 9 years agoHelpfull: Yes(0) No(0)
• answer of second question is 39
• 9 years agoHelpfull: Yes(0) No(1)