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Let 2 nd , 8 th and 44 th terms of a non-constant A.P. be respectively the 1 st , 2 nd and 3 rd terms of a G.P. If the first term of the A.P. is 1, then the sum of its first 20 terms is equal to

1. 990
2. 960
3. 980
4. 970

Correct answer: 970

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