Number Series practice problems along with Concept of Quantitative Aptitude section for Bank Exams - Day 2

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1)    2,6, 18,54,162,486,__?

Answer: 1458. (Numbers in the series are multiplied by 3 to get next number i.e  2X3=6, 6X3=18,18X3=54,….486X3=1458)

2 .) 12,24 ,72,288,1440,___?

Answer: 8640. ( Numbers in the series are multiplied by continuous prime numbers starting with 2. i.e  12X2=24, 24X3=72,72X4=288, 288X5=1440, 1440X6=8640.)

3) 4,18, 54, 100, 180,__?

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Answer: 294. ( Numbers in the series are obtained by multiplying prime numbers Squares sequence  with prime numbers in increasing order. I . e   2²  X 1= 4, 3² X 2=18, 4² X3=48,5² X4 =100 , 6²  X 5 = 180, 7² X 6=294.)

4) 5,25, 61, 113,___?

Answer: 181 ( This  is the series in which squares of prime numbers are added together . i.e 1² +2² =5,  3² +4² =25, 5 ²+ 6²   = 61, 7²  + 8²  = 113,9²+10 ²  = 181)        

5)  100,40,16, 6.4,__?

Answer:   2.56 ( In this series , each number is obtained by multiplying the preceding number with 2/5 i.e 100*2/5=40,40*2/5=16,16*2/5=6.4,6.4*2/5=2.56 )


6) 5690,5121,4552,3983,3414,2845,___?

Answer: 2276 ( In this every number is subtracted with 569 to get following number i.e 5690-569=5121,5121-569=4552,4552-569=3983,..2845-569=2276.)

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