DIFFICULT Solve this puzzle - 6,4,5,1,3,8,7,4

How can we choose 16*3 as answer?? How 52 34 is relating to reach 48?
Coz look the middle number in the previous two.....it is greater than first and third number..
And the third number is coming comfortable between the range of first and second number...so in this case third number would be between 13 and 17... So possible options are 14,15,16