General Studies · Mathematical Operations
यदि '+' और '-' को आपस में बदल दिया जाए और 'x' और '÷' को आपस में बदल दिया जाए, तो निम्नलिखित समीकरण में प्रश्नवाचक चिन्ह (?) के स्थान पर क्या आएगा? 42 + 37 - 7 x 7 ÷ 49 = ?
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