The number of onto functions from the set {1,2,..........,11} to set {1,2,.....,10}is
A
5×|11–––
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B
|10–––
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C
|11–––2
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D
10×|11–––
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Solution
The correct option is C5×|11––– Finding no. of such functions is same as putting 11 balls in 10 boxes with each box getting at least one ball. Then the only possible way is to put 2 balls in a box which can be done in 11C2 ways.