5,21,47,91,(?),265,411 Find a number replacing (?) in the series.

5,21,47,91,(?),265,411 Find a number replacing (?) in the series.

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5 Answers
Top Voted Recent Answer
  • 161....if we look at difference of the given series 16,26,44,.....it also looks like a series in which difference is increased each time by (previous difference +8) so the next differnce is (44-26+8) i.e 26 hence now difference series is 16,26,44,70, so we have to add 70 to 91 to get the answer which is 161....Sorry for poor english
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  • The number replacing (?) in the series is 161.
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  • 161
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  • THIS IS 2 TIER SERIES.THERE IS DIFFERENCE OF EACH NUMBER.
    16,26,44,X,Y,146
    So now if you notice there is again a series (every next number will be 8 more then previous one)
    10,10+8,P
    P = 10+8+8
    P = 26
    So X = 44+26 = 70
    So the answer will be 91+70 = 161 
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  • This is called as 2 tier series .You will get a series of the differece of each number.Something like this
    16,26,44,X,Y,146
    So now if you notice there is again a series (every next number will be 8 more then previous one)
    10,10+8,P
    P = 10+8+8
    P = 26
    So X = 44+26 = 70
    So the answer will be 91+70 = 161 
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