Which two signs should be interchanged to make the given equation correct? 646 ÷ 19 – 746 + 20 × 34 = 100

‘–’ and ‘×’ ‘×’and ‘+’ ‘–’ and ‘+’ ‘×’ and ‘÷’

‘–’ and ‘+’

646 ÷ 19 + 746 – 20 × 34  =  100 34 + 746 – 680 780 – 680 =  100