If `a ,b ,a n dc` be in G.P. and `a+x ,b+x ,a n dc+x` in H.P. then find the value of `x(a ,ba n dca r ed i s t in c tnu m b e r s)` .

If a,b,c are in G.P and a+x,b+x,c+x are in H.P,then the value of x is (a,b,c are distinct numbers)

Given that X ~ B( n=10, p) .If E (x) = 8, find the value of p .

Given X~B(n,p) if E(X) = 6, Var (X) = 4.2 , find the value of n and p.

Given that X ~ B( n=10, p) .If E (x) = 8, find the value of p .is

If a ,ba n dc are in A.P., and pa n dp ' are respectively, A.M. and G.M. between aa n dbw h i l eq , q ' are , respectively, the A.M. and G.M. between ba n dc , then p^2+q^2=p^('2)+q^('2) b. p q=p ' q ' c. p^2-q^2=p^('2)-q^('2) d. none of these

Let a, x, b are in A.P., a, y, b are in G.P. and a, z, b are in H.P. If x = y + 2 and a = 5z then (where a, b, c e R*)

If a,b,c are in G.P.,prove that: log_(a)x,log_(b)x,log_(c)x are in H.P.

For X ~ B (n,p) and E (X) = 12, Var (X) = 4, then the value of n is

If 1/(b-a)+1/(b-c)=1/a+1/c , then A. a ,b ,a n dc are in H.P. B. a ,b ,a n dc are in A.P. C. b=a+c D. 3a=b+c