General Studies · Mathematical Operations

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

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