Maths-
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Easy

Question

If R rightwards arrow R d i f i n e d blank b y blank f open parentheses x close parentheses equals x minus open square brackets x close square brackets left parenthesis w h e r e [x] is the greatest integer not exceeding (x) then the set of discontinuity of f is...

  1. the empty set    
  2. R    
  3. Z    
  4. N    

The correct answer is: Z

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f open parentheses x close parentheses equals open curly brackets table row cell open square brackets x close square brackets blank i f minus 3 less than x less or equal than negative 1 end cell row cell open vertical bar x close vertical bar blank i f minus 1 less than x less than 1 end cell row cell open vertical bar left square bracket negative x right square bracket close vertical bar blank i f blank 1 less or equal than x less than 3 end cell end table closethen {x/f(x)greater or equal than 0}=

f open parentheses x close parentheses equals open curly brackets table row cell open square brackets x close square brackets blank i f minus 3 less than x less or equal than negative 1 end cell row cell open vertical bar x close vertical bar blank i f minus 1 less than x less than 1 end cell row cell open vertical bar left square bracket negative x right square bracket close vertical bar blank i f blank 1 less or equal than x less than 3 end cell end table closethen {x/f(x)greater or equal than 0}=

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Ifblank f blank open square brackets x close square bracketsdenotes the greatestinterger not exceeding x and if the function f defined byblank f open parentheses x close parentheses equals open curly brackets table row cell fraction numerator a plus 2 blank c o s blank x over denominator x to the power of 2 end exponent end fraction blank left parenthesis x less than 0 right parenthesis end cell row cell b blank t a n fraction numerator pi over denominator left square bracket x plus 4 right square bracket end fraction text end text text ( end text text x end text greater or equal than 0 text ) end text text end text end cell end table close text  is continuous at  end text x equals 0 text  then end text the order pair (a,b)=

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