What will come in the place of '?' in the following equation, if '+' and '-' are interchanged and '×' and '÷' are interchanged?
108 × 9 + 15 - 17 ÷ 2 = ?

If the two signs '+' and '÷' are interchanged, which of the following equations will be correct?

If '×' means 'subtraction', '+' means 'division', '-' means 'addition' and '+' means 'multiplication', what will be the value of the following expression?
30 + [{(12 - 13) × (5 ÷ 2)} + (18 × 13)] 

Select correct combination of mathematical signs that can sequentially replace the * signs and balance the given equation.
56*7*2*4*12*8