www.plusacademy.in | www.facebook.com/plusacademy Guess paper proof A 14 – 03 – 2015 Part – III MATHEMATICS, Paper – II (A) (Algebra and Probability) Time: 3 hours Max. Marks: 75 Section – A Very short answer types questions. i) Answer all questions ii) Each questions carries two marks 1. Find the real and imaginary parts of the complex number .(concept problem,p.no:8) 2. Represent the complex number 2 + 3i in argand plane. (out of problem) 3. If .(Q.NO:28,29,39 are the cube roots of unity then that Method) 4. Find the values of m, if the equation x2 – 15 – m(2x – 8) = 0have equal roots. (Q.NO:38 direct problem) 5. Find the polynomial equation whose roots are the reciprocals of the roots of x4- 3x3 + 7x2 + 5x - 2 =0. 6. If = 42, (Q.NO:63 direct problem) , find n (Q.NO:67 direct problem) 7. Find the number of ways of selecting 4 boys and 3 girls from a group of boys and 5 girls. (P.NO:186 , concept problem) Sol: = 70 10 = 700 8. If the coefficients of term and term in the expansion of are equal, then find r. (Q.NO: 82, 83 - Method) 9. Find the mean deviation about the median for the following data: 4, 6, 9, 3, 10, 13, 2 (Q.NO:102 ( C ) , Direct problem) 10. The mean and variance of a binomial distribution are 4 and 3 respectively. Fix the distribution and find P(X 1). Senior Intermediate | 2A IPE 2015 Question paper (Q.NO:111 , Direct problem) | [email protected] www.plusacademy.in | www.facebook.com/plusacademy Section – B Short answer types questions. (i) Attempt any five questions (ii) Each questions carries four marks , show that 4x2 – 1 = 0. 11. If 12. Solve 2x4 + x3 – 11x2 + x + 2 = 0. (Q.NO:116 , Direct problem) (P.NO:69, II(3) ) 13. Find the sum of all 4 digit numbers that can be formed using the digits 0, 2, 4, 7, 8 without repetition. (Q.NO:168 , Direct problem) 14. Find the number of ways of forming a committee of 5 numbers out of 6 Indians and 5 Americans so that always the Indians will be in majority in the committee. (Q.NO:162 , Direct problem) 15. Resolve into partial fractions. (Q.NO:186 , 2nd Method) 16. If A, B are two events with , then find the value of P(Ac) + P(Bc). (P.NO:338(13) , 2M Method ) Sol: = P(A) + P(B) – P(A) + P(B) = = 0.65 + 0.15 = 0.8 1Mark P(Ac) + P(Bc) = 1- P(A) + 1 – P(B) = 2 – [P(A) + P(B)] 1 Mark =2 – 0.8 = 1.2 17. Find the probability of drawing an ace or a spade from a well shuffled pack of 52 playing cards. (4th example , P.NO:323 ) – 2M Sol: A pack of cards contains a total of 52 cards. These 52 cards are divided into 4 sets namely Hearts, Diamonds, Spades and Clubs. Each set consists of 13 cards, namely. A, 2, 3, 4, 5, 6, 7, 8, 10, J, Q, K (Here : A: Ace, K : King, Q:Queen, J:Jack) www.plusacademy.in Senior Intermediate | 2A IPE 2015 Question paper | [email protected] www.plusacademy.in | www.facebook.com/plusacademy Section – C Long answer types questions. (i) Attempt any five questions (ii) Each questions carries seven marks 18. If show that + (Q.NO:203 , Direct problem) 19. Solve 3x3 – 26x2 + 52x – 24 = 0, given that the roots are in geometric progression. (Q.NO:214, Method) 20. For r = 0, 1, 2,………n prove that C0 . Cr + C1 . Cr+1 + C2 . Cr+2 + ……. + Cn-r . Cn = (Q.NO:233 , Direct problem) And hence deduce that (i) C02 + C12 + C22 + …………………+Cn2 = (ii) C0 . C1 + C1 . C2 + C2 . C3 +………………….. +Cn-1 . Cn = 21. Find the sum of the infinite series ………… (Q.NO:244, Direct problem) 22. Find the variance and standard deviation of the following frequency distribution: (P. NO:11th example, p. no:291, Method – example 12 - 295) xi 4 8 11 17 20 24 32 fi 3 5 9 5 4 3 1 23. If A, B, C are three independent evens of an experiment such that, P(A Bc Cc) = , P(Ac Bc Cc) = , then find P(A), P(B), P(C). (P. NO:337) 24. The range of a random variable X is {0, 1, 2}. Given that P(X=0)= 3c3, P(X=1)=4c10c2, P(X=2)=5c=1 (Q.NO: 355, II(1)) (i) Find the value of c. (ii) P(X<1), P(1<X 3). Note: P.NO Telugu Akademi text book page number Direct problems total scoring : 43 Method problems total scoring : 30 Total Scoring: 43 + 30 = 73 www.plusacademy.in [email protected] Senior Intermediate | 2A IPE 2015 Question paper | [email protected]
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