1.Set Theory
medium

જો $n(U)$ = $600$ , $n(A)$ = $100$ , $n(B)$ = $200$ અને $n(A \cap  B )$ = $50$ હોય તો $n(\bar A  \cap \bar B )$ = 

($U$ એ સાર્વતિક ગણ અને $A$ અને $B$ એ ગણ $U$ ના ઉપગણો છે)

A

$300$

B

$350$

C

$250$

D

$200$

Solution

$\mathrm{n}(\overline{\mathrm{A}} \cap \overline{\mathrm{B}})=\mathrm{n}(\overline{\mathrm{A} \cup \mathrm{B}})$

$=\mathrm{n}(\mathrm{u})-\mathrm{n}(\mathrm{A} \cup \mathrm{B})$

$=600-(\mathrm{n}(\mathrm{A})+\mathrm{n}(\mathrm{B})-\mathrm{n}(\mathrm{A} \cap \mathrm{B}))$

$=600-100-200+50=350$

Standard 11
Mathematics

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