If 16 – 4 = 2, 9 – 3 = 2, 81 – 3 = 4, then the value of 64 – 4 is :यदि 16 – 4 = 2, 9 – 3 = 2, 81 – 3 = 4 हो, तो 64 – 4 का मान है :

1. A3
2. B2
3. C4
4. D6

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Correct answer: A. 3

Explanation

The sign '-' stands for a logarithm to the second number as base: log base 4 of 16 = 2, log base 3 of 9 = 2, log base 3 of 81 = 4. So 64 - 4 means log base 4 of 64 = 3 (since 4³ = 64). Hence the answer is 3.चिह्न '-' का अर्थ है दूसरी संख्या को आधार मानकर लघुगणक: 16 का आधार 4 पर log = 2, 9 का आधार 3 पर log = 2, 81 का आधार 3 पर log = 4। अतः 64 - 4 का अर्थ 64 का आधार 4 पर log = 3 (क्योंकि 4³ = 64)। अतः उत्तर 3 है।