নিচের কোন সংখ্যাটি প্রদত্ত সিরিজের প্রশ্ন চিহ্ন (?) প্রতিস্থাপন করবে?

20, 30, 42, 56,?, 90

This question was previously asked in
SSC JE Electrical 9 Oct 2023 Shift 3 Official Paper-I
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  1. 58
  2. 78
  3. 36
  4. 72

Answer (Detailed Solution Below)

Option 4 : 72
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এখানে অনুসরণ করা প্যাটার্ন হল,

qImage6780f0d30afbaf1ab5fc6ad2

সুতরাং, সঠিক উত্তর হল "72"।

বিকল্প পদ্ধতি

এখানে অনুসরণ করা প্যাটার্ন হল,

4 x 5 = 20

5 x 6 = 30

6 x 7 = 42

7 x 8 = 56

8 x 9 = 72

9 x 10 = 90

সুতরাং, সঠিক উত্তর হল "72"।

বিকল্প পদ্ধতি

এখানে অনুসরণ করা প্যাটার্ন হল,

4 2 + 4 = 20

52 + 5 = 30

6 2 + 6 = 42

7 2 + 7 = 56

8 2 + 8 = 72

9 2 + 9 = 90

সুতরাং, সঠিক উত্তর হল "72"।

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