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2 answers:
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0.45 times what=0.90?
seems to be 2
for
and 
, (1 term and the next)
common ratio=
0.45 and 0.9
0.9/0.45=2
common ratio is 2
seems to be 2
for
common ratio=
0.45 and 0.9
0.9/0.45=2
common ratio is 2