Question

find the wrong number in the series-opp-7,28,63,124,215,342,511

Answer 1

I think 1 ya minus seven

Answer 2

28 is wrong 
bcoz
7=2^3-1
63=4^3-1 and so on 
the second term should not be 28
it should be 26=3^3-1
   ;hope this answer would help u.....