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 Practice with selective questions that cover the full range of number series problems in competitive exams 

This section is dedicated not only to the candidates but also to the people who love math puzzles and are happy to solve number problems and questions in number series

 

91. Find  the missing number

 

 

Answer  The pattern is:This is alternating addition series in which 2 is added twice, then 3 is added once, then 2 is added twice, and so on.The answer is 75,77 

 

92. Find the missing number

 

 

  Answer  The pattern is:This is an alternating addition and subtraction series, in which the addition of 6 is alternated with the subtraction of 3. The answer is 35,32

 

93. Find the missing number

 

 

  Answer  The pattern is:The differences of the consecutive numbers are 64, 49, 36, 25,... These numbers are perfect squares of: 8, 7, 6, 5 The next number is 4²=16 So the next term in the series is -46-16=-62

 

94. Find the missing number

 

  Answer  The pattern is:The differences of the consecutive numbers are 1, 8, 27, 64, These numbers are perfect cubes of: 1, 2, 3, 4 the next number is 5³=125 So the next term in the given series is 36+125=161

 

95. Find the missing number

 

  Answer  The pattern is:8x2-1=15 15x2-1=29 29x2-1=57 57x2-1=113 So 113x2-1=225

 

96. Find the missing number 

 

 

  Answer  The pattern is:2 2x2+1=5 5 5x2+2=12 12 12x2+3=27 27 27x2+4 =58 58 58x2+5=121

 

97. Find the missing number

 

 

 

 

  Answer  The pattern is:4x2+1=9 9 9x2+3=21 21 21x2+5=47 47 47x2+7=101 101 101x2+9=211 

 

 

 

 

98. Find the missing number

 

  Answer  The pattern is:3x2=6 6x3=18 18x4=72 72x5=360 360x6=2160

 

99. Find the missing number

 

  Answer  The pattern is:5+1+1²=7 7+2+2²=13 13+3+3²25 25+4+4² =45 45+5+5² = 75

 

100. Find the missing number

 

 

Answer  The pattern is:The differences of the terms are: 888-672=216 216=6³ 672-547=125 125=5³ 547-483=64 64=4³ 483-456=27 27=3³ Therefore the next term is 456-2³=456-8=444 

 

 

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