(1373)36 – (1442)20 का इकाई अंक क्या है?

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RRB ALP Electrician 22 Jan 2019 Official Paper (Shift 1)
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  1. 2
  2. 4
  3. 3
  4. 5

Answer (Detailed Solution Below)

Option 4 : 5
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अवधारणा:

इकाई अंक ज्ञात करने के लिए, दी गयी संख्या का इकाई अंक लेते हैं और घात से इसकी चक्रीयता ज्ञात करते हैं। 

उदाहरण: 25

∵ इकाई अंक के रूप में 2 को प्रत्येक 4 घात के बाद दोहराया जाता है, 21 = 2, 22 = 4, 23 = 8, 24 = 16, 25 = 32

⇒ 2 की चक्रीयता = 4

25 का इकाई अंक = 21 = 2

उसी प्रकार, 3 की चक्रीयता = 4

गणना:

(1373)36 – (1442)20 का इकाई अंक 

⇒ (3)36 – (2)20 का इकाई अंक 

⇒ {(3)9 × 4 – (2)5 × 4} का इकाई अंक 

⇒ {(3)4 – (2)4} का इकाई अंक 

⇒ {81 – 16} का इकाई अंक 

⇒ 65 का इकाई अंक 

⇒ 5

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