A.P LECTURE 2

If the pth term of an A.P. is (2p+3), find the A.P.

If the n^(t h) term of an A.P. is (2n+1), find the sum of first n terms of the A.P.

If l n(a+c),l n(a-c) and l n(a-2b+c) are in A.P., then (a) a ,b ,c are in A.P. (b) a^2,b^2, c^2, are in A.P. (c) a ,b ,c are in G.P. (d) a ,b ,c are in H.P.

1,3,9 can be terms of (A) an A.P.but not of a G.P (B) G.P. but not of an A.P. (C) A.P. and G.P both (D) neither A.P nor G.P

The sum of the first n terms of an A.P. is 4n^2+2n . Find the n t h term of this A.P.

In a /_\ABC, tan\ A/2 = 5/6 and tan\ C/2 = 2/5 then (A) a,c,b are in A.P. (B) a,b,c are in A.P. (C) b,a,c are in A.P. (D) a,b,c are in G.P.

The sum of first n terms of an A.P. is 3n^2+4n . Find the 25 t h term of this A.P.

The sum of the first n terms of an A.P. is 3n^2+6n . Find the n^(th) term of this A.P.

If x,y,z, are in A.P. and x^(2),y^(2),z^(2) are in H.P., then which of the following is correct ?

If a, b, c are distinct real numbers such that a, b, c are in A.P. and a^2, b^2, c^2 are in H. P , then