Mathematics · Mathematical Operations
यदि '+' और '-' को आपस में बदल दिया जाता है तथा '×' और '÷' को आपस में बदल दिया जाता है, तो निम्नलिखित समीकरण में प्रश्न चिह्न (?) के स्थान पर क्या आएगा? 15 - 11 + 16 ÷ 21 × 3 = ?
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