1.Relation and Function
medium

જો દરેક $x \in R$ માટે વિધેય $f:R \to R$ અને $g:R \to R$ એ $f(x) = \;|x|$ અને $g(x) = \;|x|$ આપેલ છે , તો $\{ x \in R\;:g(f(x)) \le f(g(x))\} = $

A

$Z \cup ( - \infty ,\;0)$

B

$( - \infty ,0)$

C

$Z$

D

$R$

Solution

(d) $g(f(x)) \le f(g(x))$ ==> $g(|x|) \le f[x]$ ==> $[|x|]\, = \,|[x]|$.

This is true for $x \in R.$.

Standard 12
Mathematics

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