An element of `I^(st)` transition series `X^(+3)` have highest magnetic moment in series and `X^(+2)` have non mangnetic nature as low spin complex. If atomic number of X is 'a' and number of unpaired `e^(-)` in free state `X^(+2) and X^(+3)` is 'b' and 'c' then calculate a+b+2c.

Answer

B, D