General Studies · Mathematical Operations
यदि '+' और '×' को आपस में बदल दिया जाता है, और '-' तथा '÷' को आपस में बदल दिया जाता है, तो निम्नलिखित समीकरण में प्रश्नवाचक चिह्न (?) के स्थान पर क्या आएगा? 21 ÷ 57 - 3 × 8 + 4 = ?
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