366 × 641 × 753 में इकाई का अंक क्या है?

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RRB ALP Fitter 23 Jan 2019 Official Paper (Shift 3)
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  1. 8
  2. 3
  3. 6
  4. 7

Answer (Detailed Solution Below)

Option 1 : 8
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दिया गया है: 7

366 × 641 × 753  

प्रयुक्त अवधारणा:

किसी संख्या के घात का इकाई अंक प्रत्येक चौथी बार स्वयं को दोहराता है।

गणना:

366 का इकाई अंक

⇒ 66/4

⇒ 2 (चूँकि 3 की चक्रीयता 4 है)

अत:, अंतिम अंक = 32

⇒ 9

और, 641 का इकाई अंक = 6

और753 का इकाई अंक

⇒ 53/4

⇒ 1 (चूँकि 7 की चक्रीयता 4 है)

अत:, अंतिम अंक = 71

⇒ 7

अब, दोनों का गुणा करें

⇒ 9 × 6 × 7 = 378

∴ इकाई का अंक 8 है।

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