Select the option that is related to the sixth number in the same way as the first number is related to the second number and the third number is related to the fourth number.

56 : 11 :: 34 : 7 :: ? : 13

76

Pattern followed is :

56 : 11

5 + 6 = 11

34 : 7

3 + 4 = 7

Similarly ,

? : 13

By observing all options . We find that only 76 has sum equals to 13 .

7 + 6 = 13 ( satisfied )

76 , is correct answer .