Cash flow diagram economics?

sister b

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compute the equiv worth at n= 4, which of the following statements are incorrect?

http://img411.imageshack.us/img411/2974/ss20110126011158.png

a) V4= [100 ( P/A, i, 6) - 100 ( P/F, i, 5)](F/P,i,4)
b) V4= 100 (F/A, i, 3) + 100 ( P/A, i, 2)
c) V4= 100 ( F/A, i, 4) - 100 + 100 (P/A, i, 2)
d) V4= [100(F/A, i, 6)- 100 (F/P,i,2)](P/F,i,2)
 
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