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

Let a_(1),a_(2),a_(3)"……." be an arithmetic progression and b_(1), b_(2), b_(3), "……." be a geometric progression 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 value of sum of sum_(i = 1)^(20) a_(i) is equal to "(a) 480 (b) 770 (c) 960 (d) 1040"

If a, b & 3c are in arithmetic progression and a, b & 4c are in geometric progression, then the possible value of (a)/(b) are

If a, b & 3c are in arithmetic progression and a, b & 4c are in geometric progression, then the possible value of (a)/(b) are

If a,b,c are in geometric progression and a,2b,3c are in arithmetic progression, then what is the common ratio r such that 0ltrlt1 ?

If a,b,c are in geometric progression and a,2b,3c are in arithmetic progression, then what is the common ratio r such that 0ltrlt1 ?

If a, b and c are in geometric progression then, a^(2), b^(2) and c^(2) are in ____ progression.

Suppose a, b and c are in Arithmetic Progression and a^2, b^2, and c^2 are in Geometric Progression. If a < b < c and a+ b+c = 3/2 then the value of a =

Three numbers a, b, c, non-zero, form an arithmetic progression. Increasing a by 1 or increasing c by 2 results in a geometric progression. Then b equals :

Let a_1,a_2,a_3,... be in harmonic progression with a_1=5a n da_(20)=25. The least positive integer n for which a_n<0 a. 22 b. 23 c. 24 d. 25

If a_1, a_2, a_3,.....a_n are in H.P. and a_1 a_2+a_2 a_3+a_3 a_4+.......a_(n-1) a_n=ka_1 a_n , then k is equal to