Question

Find the wrong series..4 5 15 49 201 1011 6073

Answer 1

49 is the wrong series because I don't know

Answer 2

Given : ..4 ,5, 15,49, 201, 1011, 6073

To find : wrong number in the series

Solution :

4 ,5, 15,49, 201, 1011, 6073

among all 5 is the wrong number

concept used :

2nd term = (1st term ×1 +2) = (4×1+2) =  6

3nd term = (2nd term ×1 +2) = (6×2+3) =  15

and so on....

hence 5 is the wrong number

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