Arithmetic Aptitude Previous Questions from PSC, UPSC and SSC

  • The average of odd numbers up to 50 is:

  • Asked : KPSC Sales Assistant : Handicrafts Development Corporation 2013
  • A30
  • B35
  • C25
  • D24
  • Explanation:

              1+3+5+7+9+10+13+15+17+19+21+23+25+27+29+31+33+35+37+39+41+43+45+47+49

                                                                              25

             =25

  • If a=√2+1 and b= 1/√2+1 then the value of  a3-b3/a2+b2+ab

  • Asked : KPSC Sales Assistant : Handicrafts Development Corporation 2013
  • A√2-1
  • B0
  • C2
  • D2√2
  • Explanation:

    Given that  a=  √2+1  and  b=  1

                                                √2+1

    a3-b3= (a-b) (a2+ab+b2)

    a3-b3/a2+b2+ab = (a-b)

    a3-b3/a2+b2+ab = √2+1-1/√2+1

    (√2+1)2-1/√2+1

    2+2√2+1-1/√2+1

    3-1+2√2/√2+1

    2+2√2/√2+1

    2(1+√2)/1+√2 =2

     

Arithmetic Aptitude Previous Question Answers PSC, UPSC, SSC, IBPS
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