please also explain why

3.49 Consider the cash flow series given. In computing the equivalent worth at n 4, which of the following equations is incorrect? Cash flow diagram V4 $100 $100 $100 $100 $100 Years (a) V [$100(PIA, i, 6) $100(P/F. i, 4)](FIP, i, 4) (b) V,-$100(FA. i, 3) + $100, P/A,i, 2) (c) V4 $100 (FIA, i,4) $100 $100(PIA, i, 2) (d) V [100(FIA, i, 6) $100(FIP, i, 2)1(P/F, i, 2) Please also explain why the equation is incorrect