If 3/4=11, 4/5=39 and 5/6=89 then 6/7= ?

Question

If
1,4,3=13;
4,5,4=9;
5,6,5=11 and
7,7,6=7
then
9,8,7=?

Answer 1

the answer is 167.
logic is-
[(3*1)*4]-1=11;
[(4*2)*5]-1=39;
[(5*3)*6]-1=89;
[(6*4)*7]-1=167;

Comments

Sir if the question asked 2/1=?then what the result

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good answer

Answer 2

1X3X4-1=11
2X4X5-1=39
3X5X6-1=89
4X6X7-1=167

Answer 3

3/4 = 11 or 3^3 - 4^2 = 11
4/5= 39 or 4^3 - 5^2 = 39
5/6 = 89 or 5^3 - 6^2 = 89
6/7 = ?? or 6^3 - 7^2 = 167

The answer is 167