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Question
 How many ways a person can buy 13 fruits of three types, mangoes ,apples and oranges. He can buy a maximum of 7 of any type and minimum of 1.
Options:
A .  21
B .  36
C .  66
D .  26
E .  None of the above options
Answer: Option B
:
B
Option (b)
A+B+C=13
Applying the lower limit of 1,
A+B+C= 10 with A,B,C<6
Using the one zero method,
Total number of cases = 12C23×5C2=36

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