Let a1,a2,a3..... be an arithmetic progr...

Let `a_1,a_2,a_3.....` be an arithmetic progression and `b_1,b_2,b_3......` be a geometric progression. The sequence `c_1,c_2,c_3,....` is such that `c_n=a_n+b_n AA n in N.` Suppose `c_1=1.c_2=4.c_3=15 and c_4=2.` The common ratio of geometric progression is equal to

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