Let A = { 1 , 3 , 7 , 9 , 11 } and B = { 2 , 4 , 5 , 7 , 8 , 10 , 12 } . Then the total number of one-one maps f : A → B , such that f ( 1 ) + f ( 3 ) = 14 , is :

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​ A = { 1 , 3 , 7 , 9 , 11 } B = { 2 , 4 , 5 , 7 , 8 , 10 , 12 } f ( 1 ) + f ( 3 ) = 14 ​ (i) 2 + 12 (ii) 4 + 10 2 × ( 2 × 5 × 4 × 3 ) = 240

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