is set A={x:x>3 and x<4} null set? then in your mcq test answer was yes 
my doubt is that why can't the answer be 3.5 is there any restriction of using fraction as answer?
 

Asked by anusha bala | 8th Apr, 2015, 09:12: PM

Expert Answer:

G i v e n space q u e s t i o n space i s colon I s space t h e space s e t space A equals open curly brackets x colon x less than 3 comma space x greater than 4 close curly brackets space i s space a space n u l l space s e t. H e r e comma space 3.5 greater than 3 space a n d space h e n c e comma space 3.5 not an element of A C o n s i d e r space 2.5 less than 3 comma space b u t space 2.5 not greater-than 4 comma space a n d space 2.5 less than 4 space a n d space h e n c e comma space 2.5 not an element of A. S o comma space t h e r e space i s space n o space apostrophe x apostrophe space f o r space w h i c h space x less than 3 space a n d space x greater than 4 H e n c e space A space i s space a space n u l l space s e t.

Answered by Vimala Ramamurthy | 9th Apr, 2015, 09:08: AM