In an equilateral triangle, inradius `r ,` circumradius `R` and ex-radius `r_1` are in A.P. (b) G.P. (c) H.P. (d) none of these

In an equilateral triangle, the inradius and the circumradius are connected by r=4R b. r=R//2 c. r=R//3 d. none of these

In an equilateral triangle,the inradius and the circumradius are connected by r=4Rb .r=R/2 c.r=R/3 d.none of these

If S be the focus and R the point of intersection of the tangents to a parabola at two points P and Q , then PS, RS and QS are in : (A) A.P. (B) G.P. (C) H.P. (D) none of these

If cos A+cos B+2cos C=2 then the sides of the A B C are in A.P. (b) G.P. (c) H.P. (d) none

In triangle ABC, if cosA+2cosB+cosC=2,t h e na ,b ,c are in (A) A.P. (B) G.P. (C) H.P. (D) none of these

In triangle ABC, if cosA+2cosB+cosC=2,t h e na ,b ,c are in (A) A.P. (B) G.P. (C) H.P. (D) none of these

If (b+c)/(a+d)= (bc)/(ad)=3 ((b-c)/(a-d)) then a,b,c,d are in (A) H.P. (B) G.P. (C) A.P. (D) none of these

If (b+c)/(a+d)= (bc)/(ad)=3 ((b-c)/(a-d)) then a,b,c,d are in (A) H.P. (B) G.P. (C) A.P. (D) none of these

If the square of differences of three numbers be in A.P., then their differences re in (A) A.P. (B) G.P. (C) H.P. (D) none of these