CAT Practice : Functions

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Greater Integer Function

Greatest Integer Function

    Q.18: Find the value of x for which x[x] = 39
    1. 6.244
    2. 6.2
    3. 6.3
    4. 6.5

 

  • Correct Answer
    Choice D. 6.5

Detailed Solution

When x = 7,
x[x] = 7 x 7 = 49
When x = 6,
x[x] = 6 x 6 = 36
Therefore, x must lie in between 6 and 7 =) [x] = 6
=) x = = 6.5
Answer choice (D).


Correct Answer: 6.5



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