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Number series questions are very important and can be seen in every bank exam. Usually 2-5 marks are allotted to this section. Though they look confusing and hard at beginning, Once you understand the concept, you can answer within seconds easily. So, let us see types of question and there concepts in number series .
1) Squares or Cubes Series: When the numbers are a series of perfect square or cube roots
1) Squares or Cubes Series: When the numbers are a series of perfect square or cube roots
Example: 25, 36, 49,64 , 81 (52,62,72,82,92)
2) Patterns in Differences: calculate the difference between the numbers in the given series. Then try to observe the pattern in newest set of numbers that obtained after taking in the series newly formed.
Example: 2, 5, 8,11 , 14 ( +3 addition for the next following number)
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3) Patterns in alternate numbers: In this type there is a pattern between every alternate or third in the series
2) Patterns in Differences: calculate the difference between the numbers in the given series. Then try to observe the pattern in newest set of numbers that obtained after taking in the series newly formed.
Example: 2, 5, 8,11 , 14 ( +3 addition for the next following number)
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3) Patterns in alternate numbers: In this type there is a pattern between every alternate or third in the series
ן------ן
Example: 2, 5, 4,10,6,15,8,20
└-----┘└-----┘└-----┘
2X2 5X3
4) Geometric series: When each number in the series is obtained by multiplying or dividing the previous number by a fixed number.
Example: 2,10,50,250,1250 ( X 5 of each number gives succeeding number in the series)
5) Repetitive odd number between a logical series: In this type of series, a single fixed number will be repeated between a sequence of logical series.
Example: 5, 10, 12,15, 20 ,12,25 .. ( In this kind of series, 12 is the fixed number which is repeated after every two numbers. Remaining sequence is 5 number multiplication sequence)
Example: 2, 5, 4,10,6,15,8,20
└-----┘└-----┘└-----┘
2X2 5X3
4) Geometric series: When each number in the series is obtained by multiplying or dividing the previous number by a fixed number.
Example: 2,10,50,250,1250 ( X 5 of each number gives succeeding number in the series)
5) Repetitive odd number between a logical series: In this type of series, a single fixed number will be repeated between a sequence of logical series.
Example: 5, 10, 12,15, 20 ,12,25 .. ( In this kind of series, 12 is the fixed number which is repeated after every two numbers. Remaining sequence is 5 number multiplication sequence)
6) Patterns in Adjacent numbers: When adjacent numbers in the series changes based on a logical pattern.
Example : 2 , 4, 12, 48 ( Each number is obtained by multiplying the previous number with increasing sequential number, X2, X3, X4 )
7) Complex Series: In this pattern, the difference between the numbers is dynamic rather than being fixed, but there will be a defined logic rule.
Example: 4,5,7,10,14,19 ( +1,+2,+3,+4,+5 sequential addition )
8) Using 2 or 3 arithmetic operators (+,-,X, /) in a sequence :
Example: 5,50,500,5000 ( +5 and X 0.5 for every number )
9) Series of square roots or cube roots: Here each number in the sequence is either square or cube root of a sequence.
Example : 2 , 4, 12, 48 ( Each number is obtained by multiplying the previous number with increasing sequential number, X2, X3, X4 )
7) Complex Series: In this pattern, the difference between the numbers is dynamic rather than being fixed, but there will be a defined logic rule.
Example: 4,5,7,10,14,19 ( +1,+2,+3,+4,+5 sequential addition )
8) Using 2 or 3 arithmetic operators (+,-,X, /) in a sequence :
Example: 5,50,500,5000 ( +5 and X 0.5 for every number )
9) Series of square roots or cube roots: Here each number in the sequence is either square or cube root of a sequence.
Example: 512, 729, 1000 (83,93,103)
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