773 के प्रसार में इकाई स्थान का अंक कौन-सा है?

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CDS Maths Previous Paper 7 (Held On: 3 Feb 2019)
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  1. 1
  2. 3
  3. 7
  4. 9

Answer (Detailed Solution Below)

Option 3 : 7
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गणना:

71  =  7 ⇒ इकाई का अंक = 7

72  =  49 ⇒ इकाई का अंक = 9

73  =  343 ⇒ इकाई का अंक = 3

74  =  2401 ⇒ इकाई का अंक = 1

इकाई के अंक का पैटर्न :- 7, 9, 3, 1, 7, 9, 3, 1.........

अब,

773 = 772 × 7

773 = (74)18 × 7

773 = (2401)18 × 7

∴ इकाई के स्थान पर अंक 7 है।

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