### State geometric progression are alternately positive

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1.The first two terms of a geometric progression add up to 12. The sum of the third and the fourth terms is 48. If the terms of the geometric progression are alternately positive and negative, then the first term is ? 2.The coordination number and the oxidation state of the element ‘E' in the complex [E(en)2 (C2O4)]NO2 (where (en) is ethylene diamine) can be?

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