ESAT Math 2: Definite Integrals & Probability

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Questions and Answers

Consider the integral $\int_0^1 \frac{3x^2 + 2x - 1}{\sqrt{x}} dx$. Which of the following represents the correct value of this definite integral?

  • $\frac{8}{15}$
  • $\frac{16}{5}$ (correct)
  • $\frac{68}{15}$
  • $\frac{28}{15}$
  • $\frac{104}{105}$

A bag contains g green beans, r red beans, and b blue beans. If three beans are chosen at random without replacement, what is the probability that exactly two of the three beans are blue?

  • $\frac{3b(b-1)(r+g)}{(g+r+b)^3}$
  • $\frac{b(b-1)(r+g)}{(g+r+b)(r+g+b-1)(r+g+b-2)}$
  • $\frac{3b(b-1)(r+g)}{(g+r+b)(r+g+b-1)(r+g+b-2)}$ (correct)
  • $\frac{b(b-1)(r+g)}{(g+r+b)^3}$
  • $\frac{3b^2(r+g)}{(g+r+b)(r+g+b-1)(r+g+b-2)}$
  • $\frac{b^2(r+g)}{(g+r+b)^3}$

A function is defined as $f(x) = \frac{x^2 - 4}{x - 2}$ for $x \neq 2$. What value should be assigned to $f(2)$ to make $f(x)$ continuous at $x = 2$?

  • Undefined
  • 2
  • 1
  • 0
  • 4 (correct)

Given the function $g(x) = x^3 - 3x^2 + 2x$, determine the interval(s) where $g(x)$ is increasing.

<p>$\left(-\infty, \frac{3 - \sqrt{3}}{3}\right) \cup \left(\frac{3 + \sqrt{3}}{3}, \infty\right)$ (A)</p> Signup and view all the answers

A geometric sequence has a first term of 3 and a common ratio of 2. What is the sum of the first 5 terms of this sequence?

<p>93 (E)</p> Signup and view all the answers

Determine the derivative of the function $f(x) = \ln(\sin(x))$, where $0 < x < \pi$.

<p>$\frac{\cos(x)}{\sin(x)}$ (A)</p> Signup and view all the answers

If $\tan(\theta) = \frac{3}{4}$ and $\theta$ is in the third quadrant, find the value of $\cos(\theta)$.

<p>$-\frac{4}{5}$ (B)</p> Signup and view all the answers

Determine the area of the region enclosed by the curves $y = x^2$ and $y = 2x$.

<p>$\frac{4}{3}$ (E)</p> Signup and view all the answers

Solve the differential equation $\frac{dy}{dx} = xy$ with the initial condition $y(0) = 2$. What is the solution $y(x)$?

<p>$y = 2e^{x^2/2}$ (B)</p> Signup and view all the answers

Given the vectors $\vec{a} = 2\mathbf{i} - \mathbf{j} + 3\mathbf{k}$ and $\vec{b} = -\mathbf{i} + 5\mathbf{j} - 2\mathbf{k}$, find the dot product $\vec{a} \cdot \vec{b}$.

<p>-13 (E)</p> Signup and view all the answers

Flashcards

Definite Integral

Evaluate the definite integral of (3x^2 + 2x - 1) / √x from 0 to 1.

Probability

The probability of choosing exactly two blue beans out of three, without replacement, from a bag containing green, red, and blue beans.

Study Notes

  • This is the Engineering and Science Admissions Test (ESAT) Mock Paper 2, specifically Part E focusing on Mathematics 2.
  • The test duration is 40 minutes.
  • Candidates will need a separate answer sheet, and should ensure they have all three pages.
  • Name should be written on each page of the answer sheet.
  • Candidates must complete PART A Mathematics 1
  • Candidates then pick 2 parts from: Biology, Chemistry, Physics. Mathematics 2
  • Parts have 27 multiple-choice questions, with 40 minutes to complete.
  • There are no penalties for incorrect answers.
  • Each question is worth one mark.
  • Candidates must complete the answer sheet within the time limit.
  • Dictionaries and calculators are not allowed.

Question 1

  • Find the value of the definite integral from 0 to 1 of (3x^2 + 2x - 1) / √x dx.
  • The possible answers are: 16/5, -28/15, 104/105, 8/15, 68/15.

Question 2

  • A bag contains g green beans, r red beans, and b blue beans.
  • Three beans are chosen at random without replacement.
  • The probability of choosing exactly two blue beans is to be determined.
  • Options: b²(r+g) / (g+r+b)³, 3b²(r+g) / ((g+r+b)(r+g+b-1)(r+g+b-2)), b(b-1)(r+g) / ((g+r+b)(r+g+b-1)(r+g+b-2)), 3b(b-1)(r+g) / (g+r+b)³, 3b(b-1)(r+g) / ((g+r+b)(r+g+b-1)(r+g+b-2)), b(b-1)(r+g) / (g+r+b)³.

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