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1. (a) 5 ,25,125,625 Geometric Progression with common ratio = 5
(b) Arithmetic progression common difference = 3
2. a) First term, a = -8
b) Common difference = (-5)- (-8) = 3
c) an = -8 +(n-1) 3 ; or -8 +3n-3 ; 3n-11
3)a) First term, a = 2
b) common ratio , r = -6/2 = - 3
c) an = 2 (-3)^(n-1)
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