In alphabet series, some alphabets are missing which are given in that order as one of the alternatives below it. Choose the correct alternative. -
ab _ bc _ c _ ba _ c
A + B means A is the son of B; A - B means A is the wife of B; A x B means A is the brother of B; A ÷ B means A is the mother of B; and A = B means A is the sister of B. What does P + R - Q mean ?
In following number series, two terms have been put within brackets. Choose the appropriate option - Find the wrong number in the series :7, 28, 63, 124, 215, 342, 511