गणितीय चिह्नों के उस संयोजन का चयन करें जिसे दिए गए रिक्त स्थानों में क्रमिक रूप से रखने पर समीकरण सही हो जाएगा: 7 _ 3 _ 4 _ 12 _ 6 = 19

If 'A' stands for '÷', 'B' stands for '×', 'C' stands for '+' and 'D' stands for '-', then what will come in place of the question mark (?) in the following equation? 12 C 52 A 13 B 7 D 31 = ?

If 'A' stands for '÷', 'B' stands for '×', 'C' stands for '+' and 'D' stands for '-', what will come in place of the question mark (?) in the following equation? (84 A 12) B 5 C 13 B 2 D 11 B 5 C 28 = ?