MATHEMATICS
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Note: All answers to questions in SectionA, SectionB, SectionC must be supported by mathematical arguments. In each of these sections order of the questions must be maintained. SECTIONA This section has Five Questions. Each question is provided with five alternative answers. Only one of them is the correct answer. Indicate the correct answer by A, B, C, D, E. (6x2=12 MARKS) 1. A triangle has integral sides. Its perimeter is 2006. One of the sides is sixteen times another side. The number of such triangles is [ ] A) 0 B) 1 C) 2 D) 3 E) 4 2. Given that ABC is an arbitrary triangle. The number of points P in the interior of the triangle such that APB = BPC = CPA is [ ] A) 0 B) 1 C) 2 D) not necessarily 0, not necessarily 1, but either 0 or 1 E) not necessarily 1, not necessarily 2, but either 1 or 2 3. The number of rhombi that can be inscribed in a parallelogram such that each side of the parallelogram contains precisely one vertex of the rhombus is [ ] A) 0 B) 1 C) 0 or 1 D) 0 or 2 E) infinitely many 4. In this question a polynomial means a polynomial with real coefficients. P(x) is a polynomial of degree 2006 and P(x) 0 for all real x. Then [ ] A) P(x) must have at least one complex root B) P(x) cannot have 2006 distinct real roots C) P(x) is a product of 1003 quadratics, none of which has linear factors. D) P(x) cannot have a polynomial factor of the form (xk)^{2005} E) none of these 5. If 0<axb, 0<ayb and , then [ ] A) a=x=y=b B) a=x<y=b C) a=y<x=b D) a=yx=b E) none of these 6. p, q, r are given real numbers. Consider the polynomials (qr)(xq)(xr) + (rp)(xr)(xp) + +(pq)(xp)(xq) + k for all real k. Then [ ] A) there exists a k such that the degree of the polynomial is 2 B) there exists a k such that the degree of the polynomial is 1 C) there exists no k such that the degree of the polynomial is 0 D) there exists no k such that the degree of the polynomial is undefined E) none of these
SECTIONB This section has Five Questions. In each question a blank is left. Fill in the blank. (6x2=12 MARKS) 1. A lattice point is a point both of whose coordinates are integers. A is (0, 0), B is (4012, 6018). If n is the number of lattice points lying on , then n = _________ 2. Two circles of equal radius r are inscribed in a semicircular sector of radius ‘1’ such that they touch each other externally. Then r = ___________ 3. In a triangle ABC, D, E are points on respectively such that and DE = 5. If AB = 8 and bisects , then the length of = ____________ 4. 1 + = ____________ 5. The characteristic of log_{3} 2006 is __________ 6. If the positive integer m is such that is closest to , then m = ________
SECTIONC (6x2=12 MARKS) 1. A(0, 0), B(4012, 0), C(4012, 6018), D(0, 6018) determine a rectangle which is the union of 4012 x 6018 unit squares. Determine the number of these unit squares which have a nonempty intersection with . 2. P is a point not lying on a line l. Explain how you construct an equilateral triangle PQR such that l. 3. Let E be the midpoint of the side of ABC and let F be chosen in so that AC=3FC. Determine the ratio of the areas, ABEF : EFC. 4. Does the equation 2006 = (x+y)^{2} + 3x + y have a solution in nonnegative integers? 5. Without removing brackets at any stage factorize 2y(y+z)(x+y)(x+z) 6. Factorize the polynomial in x: (t^{2}+1)x^{3} – (t^{2}1)x^{2} – (t^{2}+1)x + (t^{2}1)
SectionD (6x4=24 MARKS) 1. Treating the equalities log_{10}2 = 0.3010 and log_{10}3 = 0.4771 as exact, prove that the sum to 30 terms of the series 2 + 6+ 18 + 54 + ….. exceeds 2x10^{14}. 2. Factorize a^{5}(bc) + b^{5}(ca) + c^{5}(ab) 3. Prove that (n+1) is either itself a prime or a product of primes for every positive integer n. 4. A triangle ABC is turned about the vertex A in the plane of the triangle into the position . If bisects , prove that bisects . 5. P is a point in the plane of parallel lines l, m. Explain how you locate a point Q on l and a point R on m such that and are equal in length and perpendicular to each other. Discuss only the case when P lies between l and m. 6. A, B, C are respectively (1002, 1005), (2004, 2001) and (1003, 1000) and P_{0} is (1, 4). Points P_{i}, iN are such that A is the midpoint of B is the midpoint of C is the midpoint of Estimate the ratio of lengths .
