निम्नलिखित समीकरण को सही बनाने के लिए किन दो चिन्हों को आपस में बदला जाना चाहिए?
 
21 + 5 × 2 – 21 ÷ 3 = 12 

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SSC GD Previous Paper 9 (Held On: 14 Feb 2019 Shift 1)
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  1. + और - 
  2. – और ÷
  3. – और ×
  4. × और ÷

Answer (Detailed Solution Below)

Option 3 : – और ×
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दिया गया समीकरण: 21 + 5 × 2 – 21 ÷ 3 = 12

1) + और -

चिन्हों को बदलने के बाद

बाएं हाथ की ओर = 21 - 5 × 2 + 21 ÷ 3 = 21 – 10 + 7 = 18 ≠ दाहिने हाथ की ओर

2) – और ÷

चिन्हों को बदलने के बाद

बाएं हाथ की ओर = 21 + 5 × 2 ÷ 21 – 3 = 21 + 0.476 – 3 = 18. 476 ≠ दाहिने हाथ की ओर

3) – और ×

चिन्हों को बदलने के बाद

बाएं हाथ की ओर = 21 + 5 - 2 × 21 ÷ 3 = 21 + 5 – 14 = 12 = दाहिने हाथ की ओर

4) × और ÷

चिन्हों को बदलने के बाद

बाएं हाथ की ओर = 21 + 2.5 – 63 = - 39.5 ≠ दाहिने हाथ की ओर

इसलिए, "- और ×" सही उत्तर है।
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