Find the ratio between HCF and LCM of the numbers 7 and 13.

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TNPSC Group 4 Official Paper 2024
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  1. 1 ∶ 91
  2. 13 ∶ 7
  3. 91 ∶ 10
  4. 7 ∶ 13

Answer (Detailed Solution Below)

Option 1 : 1 ∶ 91
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TNPSC Group 2 CT : General Tamil (Mock Test பயிற்சித் தேர்வு)
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Detailed Solution

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Given:

Numbers are 7 and 13.

Formula Used:

HCF (Highest Common Factor) and LCM (Least Common Multiple) of two numbers.

HCF of two prime numbers = 1

LCM of two prime numbers = Product of the numbers

Ratio between HCF and LCM = HCF / LCM

Calculation:

HCF of 7 and 13 = 1

LCM of 7 and 13 = 7 × 13

LCM = 91

Ratio = HCF / LCM

Ratio = 1 / 91

Therefore, the ratio between HCF and LCM of the numbers 7 and 13 is 1 ∶ 91.

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