1.Relation and Function
hard

समुच्चय $A =\{x:|x|<3, x \in Z\}$, जहाँ $Z$ पूर्णांकों का समुच्चय है, पर एक संबंध $R$, $R =\{(x, y): y=|x|, x \neq-1\}$ द्वारा परिभाषित है। तो $R$ के घात समुच्यय में अवयवों की संख्या है

A

$32$

B

$16$

C

$8$

D

$64$

(JEE MAIN-2014)

Solution

$A = \left\{ {x:\left| x \right| < 3,x \in Z} \right\}$

$A = \left\{ { – 2, – 1,0,1,2} \right\}$

$R = \left\{ {\left( {x,y} \right):y = \left| x \right|,x \ne  – 1} \right\}$

$R = \left\{ {\left( { – 2,2} \right),\left( {0,0} \right),\left( {1,1} \right),\left( {2,2} \right)} \right\}$

$R$ has four elements

Number of elements in the power set of $R$

$ = {2^4} = 16$

Standard 12
Mathematics

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