If `18 ,\ a ,\ b ,\ -3` are in A.P., the `a+b=` (a) 19 (b) 7 (c) 11 (d) 15

If a,b,c are in A.P., then 7^(a) , 7^(b) and 7^(c ) are in :

If a,b,c,d,e,f are in A.P. then d-b= ……

Let a,b,c are 7^(th) , 11^(th) and 13^(th) terms of constant A.P if a,b,c are also is G.P then find (a)/(c ) (a) 1 (b) 2 (c) 3 (d) 4

Let a,b,c are 7^(th), 11^(th) and 13^(th) terms of constant A.P if a,b,c are also is G.P then find (a)/(c ) (a) 1 (b) 2 (c) 3 (d) 4

The number of terms of the A.P. 3,\ 7,\ 11 ,\ 15 ,\ ddot to be taken so that the sum is 406 is (a) 5 (b) 10 (c) 12 (d) 14

The number of terms of the A.P. 3,\ 7,\ 11 ,\ 15 ,\ ddot to be taken so that the sum is 406 is (a) 5 (b) 10 (c) 12 (d) 14

If a, b, c, d are in A.P. and a, b, c, d are in G.P., show that a^(2) - d^(2) = 3(b^(2) - ad) .

If a,b,c are in A.P ,then 3^(a),3^(b),3^(c) shall be in (A) A.P (B) G.P (C) H.P (D) None of these

If a, c, b are in A.P. and b, c, d are in G.P. prove that, b, (b-c), (d-a) are in G.P.

If a ,b ,c are in A.P., the a/(b c),1/c ,1/b will be in a. A.P b. G.P. c. H.P. d. none of these