Hi

Geometric Series



 = a(1-r^n)/(1-r)

A)  = 5(1-10^6)/(1-10) = 5 *-999999/-9 = 555,555

B) a[6]= a[1]r^5 = 24 and a[4] = a[1]r^3= 6 

     a[1] = 6/r^3    (6/r^3)r^5 = 24  r^2 = 4, r = 2 and a[1] = 6/8 = 3/4

 = 3/4*(1-2^6)/-1 = 47.25 

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