solve Q 6

solve Q 6 5. 6. 7. 8. 9. If a, b; c are in A P then (a — c)? equals (B) 4(b2+ac) (D) b2 — 4ac (C) 4b2 — ac Ifthe sum of n terms of an AP is Pn +Qn2, where P Q are constants, then its common difference is Given a sequence of 4 numbers, first three of which are in G.P. and the last three are in A.P. with •common difference six. If first and last terms of this sequence are equal. then the last term is : WEE-MAINS Online 20131 (B) 16 The first term of an infinite G.P. is I and every term is equals to the sum of the successive terms, then its fourth term will be- 1 2 4 1 16 8 2 is equal to If G be the GM between x and y, then the value of 2 (D) 3G2 to n terms = 2+4+7+

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