Q.9.Find the value of

Let the sum sum _( n =1) ^(9) (1)/(n ( n +1) ( n +2)) written in its lowest terms be p /q. Find the value of q-p.

Four point charge q, - q, 2Q and Q are placed in order at the corners A, B, C and D of a square. If the field at the midpoint of CD is zero then the value of q//Q is (5 sqrt5)/(x) . Find the value of x.

If lim_(x to 0) (x^(9) + a^(9))/(x + a) = 9 , find the value of a

If 24 a is divisible by 9, find the value of a .

If the binary operation ** , defined on Q , is defined as a**b=2a+b-a b , for all a **\ b in Q, find the value of 3**4

In Fig.83, P Q || R S Find the value of xdot

Charges 4Q, q and Q and placed along x-axis at positions x=0,x=1//2 and x=1 , respectively. Find the value of q so that force on charge Q is zero

If 5x21 is divisible by 9, find the value of digit x.

If 42x is divisible by 9, find the value of digit x.

If the points P(-3,\ 9),\ \ Q(a ,\ b) and R(4,\ -5) are collinear and a+b=1 , find the values of a and b .