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Comprehension (6 to 8) Given a special sequence, a, b, c, d such that first three number are in A.P. while the last three are in G.P. If the first number is 18 and common ratio of G.P. is `1/2` , then answer the following questions The value of `c+d` is given by 9 (b) 10 (c) 11 (d) 12

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