নিম্নলিখিত সমীকরণটিকে সঠিক করতে কোন দুটি চিহ্নকে অদলবদল করা প্রয়োজন?

21 + 5 × 2 – 21 ÷ 3 = 12

This question was previously asked in
SSC GD Previous Paper 9 (Held On: 14 Feb 2019 Shift 1)
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  1. + এবং -
  2. - এবং ÷
  3. - এবং ×
  4. × এবং ÷

Answer (Detailed Solution Below)

Option 3 : - এবং ×
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Detailed Solution

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প্রদত্ত সমীকরণ: 21 + 5 × 2 - 21 ÷ 3 = 12

1) + এবং -

চিহ্ন অদলবদলের পরে

বামদিক = 21 - 5 × 2 + 21 ÷ 3 = 21 - 10 + 7 = 18 ≠ ডানদিক

2) - এবং ÷

চিহ্ন অদলবদলের পরে

বামদিক = 21 + 5 × 2 ÷ 21 - 3 = 21 + 0.476 - 3 = 18. 476 ≠ ডানদিক

3) - এবং ×

চিহ্ন অদলবদলের পরে

বামদিক = 21 + 5 - 2 × 21 ÷ 3 = 21 + 5 - 14 = 12 = ডানদিক

4) × এবং ÷

চিহ্ন অদলবদলের পরে

বামদিক = 21 + 5 ÷ 2 - 21 × 3 = 21 + 2.5 - 63 = - 39.5 ≠ ডানদিক

সুতরাং, "- এবং ×" হল সঠিক উত্তর।
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