Mathematics · Mathematical Operations
यदि '+' और '÷' को आपस में बदल दिया जाए तथा '×' और '-' को आपस में बदल दिया जाए, तो निम्नलिखित समीकरण में प्रश्नवाचक चिह्न (?) के स्थान पर क्या आएगा? 42 ÷ 6 - 16 + 4 × 21 = ?
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