दो चिन्हों ÷ और + तथा दो संख्याओं 9 और 12 (अंकों को नहीं) को आपस में बदलने पर, निम्नलिखित में से कौन सा समीकरण सही नहीं होगा? I. 12 × 2 – 72 + 9 ÷ 57 = 69 II. 169 + 13 × 12 ÷ 3 – 9 = 108

What will come in place of the question mark (?) in the following equation, if '+' and '-' are interchanged and '×' and '÷' are interchanged? 37 ÷ 5 - 91 + 16 × 4 = ?

If '+' and '-' are interchanged, and '×' and '÷' are interchanged, then what will come in place of the question mark (?) in the following equation? 26 ÷ 676 × 156 - 69 + 83 = ?