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Using arithmetic and geometric progressions work out the following: An oil rig drills to a depth of 1000metres. Estimate the cost of drilling if the ...
my terms are t1= 47 860 t2= 47 860 t3= 95 720 r = t2/t1 r = 47 860/47 860 r = 1 r = t3/t2 r = 95 720/47 860 r = 2 I end up with two Rs!!