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Mathematics Jamb Past QuestionsQuestions and Answers on Geometric progressionQuestion 21 :Three consecutive terms of a geometric progression are given as n-2, n and n+3. Find the common ratio A. 1/4 B. 1/2 C. 2/3 D. 3/2 Question 22 :Find the sum to infinity of the series 1/2 , 1/6, 1/18, ..... A. 2/3 B. 1/3 C. 3/4 D. 1 Question 23 :Find the sum of the first 20 terms of the series 8, 12, 16, ....., 96 A. 1400 B. 1040 C. 960 D. 920 Question 24 :How many terms of the series 3, -6, +12, - 24, + ..... are needed to make a total of 1-28? A. 12 B. 10 C. 9 D. 8 Question 25 :The nth term of the sequence 3/2, 3, 7, 16, 35, 74 ..... is A. 5 . 2n-2 - n B. 5 . 2n-2 - (n+1) / 2 C. 3 . 2n-2 D. 3/2 n |
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