பின்வரும் எண்களில் எது பகு எண்?

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RRB ALP CBT I 30 Aug 2018 Shift 3 Official Paper
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  1. 51
  2. 41
  3. 61
  4. 31

Answer (Detailed Solution Below)

Option 1 : 51
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பயன்படுத்தப்பட்ட கருத்து:

1. ஒரு பகு எண் என்பது இரண்டு சிறிய மிகை முழு எண்களைப் பெருக்குவதன் மூலம் உருவாக்கப்படும் மிகை முழு எண் ஆகும்.

2. பகா எண்கள் இயல் எண்கள் (>=2) அவை 1 மற்றும் எண்ணால் மட்டுமே வகுபடும்.

கணக்கீடு:

51 = 3 × 17

41 = 41 × 1

61 = 61 × 1

31 = 31 × 1

∴ விருப்பங்களில் 51 மட்டுமே ஒரு பகு எண்.

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