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GATE 2017-2018 :: GATE Mathematics

  1. Suppose the random variable U has uniform distribution on [0,1] and X =−2logU. The density of X is
  2. A.
    .

    B.
    .

    C.
    .

    D.
    .

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  3. Let f be an entire function on ℂ such that |f(z)| ≤ 100 log|z| for each z with |z| ≥ 2. If F(i) = 2i then f(1)
  4. A.
    must be 2
    B.
    must be 2i
    C.
    must be i
    D.
    cannot be determined from the given data

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  5. The number of group homomorphisms from ℤ3 to ℤ9 is ______
  6. A.
    2
    B.
    8
    C.
    3
    D.
    9

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  7. Let  Then
  8. A.
    .

    B.
    .

    C.
    .

    D.
    .

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  9. Suppose X is a random variable with P(X = k) = (1 - p)kp for k ∈ {0,1,2,..} and some p ∈ (0,1). For the hypothesis testing problem 
    H0:p = 1/2 H1:p ≠ 1/2 
    consider the test "Reject H0 if X ≤ A or if X ≥ B", where A < B are given positive integers. The type-I error of this test is
  10. A.
    1 + 2-B - 2-A
    B.
    1 - 2-B + 2-A
    C.
    1 + 2-B - 2-A-1
    D.
    1 - 2-B + 2-A-1

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  11. Let G be a group of order 231. The number of elements of order 11 in G is ______
  12. A.
    10
    B.
    15
    C.
    20
    D.
    25

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  13. Let f:ℝ2→ℝ2 be defined by f(x,y) = (ex+y, ex-y). The area of the image of the region {(x,y) ∈ℝ2:0 < x,y < 1} under the mapping f is
  14. A.
    1
    B.
    e - 1
    C.
    e2
    D.
    e2 - 1

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  15. Which of the following is a field?
  16. A.
    ℂ[x]/〈x2+2〉
    B.
    ℤ[x]/〈x2+2〉
    C.
    ℚ[x]/〈x2-2〉
    D.
    ℝ[x]/〈x2-2〉

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  17. Let x0 = 0. Define xn+1 = cos xn for every n≥0. Then
  18. A.
    {xn} is increasing and convergent
    B.
    {xn} is decreasing and convergent
    C.
    {xn} is convergent and x2n < limm-->∞ xm < x2n+1 for every n ∈ ℕ
    D.
    {xn} is not convergent

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  19. Let C be the contour |z| = 2 oriented in the anti-clockwise direction. The value of the integral  is
  20. A.
    3Ï€i
    B.
    5Ï€i
    C.
    7Ï€i
    D.
    9Ï€i

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