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Multiple choice

The largest number which divides 61, 72 and 83 to leave remainders 1, 2 and 3 respectively is ( - )

  1. 20

  2. 15

  3. 12

  4. 10

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Required number divides (61-1), (72-2), (83-3) i.e., 60, 70, 80 exactly. HCF(60, 70, 80) = 10. Check: 60 = 10×6, 70 = 10×7, 80 = 10×8. HCF is 10. Option D is correct.

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