Mathematics 2012 | Study Mode

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Question 31
A
1
B
2
C
3
D
4
Explanation

Explanation not provided, please join discuss, your contributions are welcomed


Correct option: A
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Question 32
A
126
B
180
C
216
D
224
Explanation
\(\frac{x}{7} = \frac{96}{1}\) ==> \(\frac{672 + x}{8} = 112\)

Therefore x = 224

Correct option: D
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Question 33
A
9
B
8
C
7
D
4
Explanation
Arrange all the values in ascending order,

2,2,3,3,3,4,4,4,4,5,5,5,7,8,9,9

Correct option: D
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Question 34
A
11
B
9
C
8
D
4
Explanation
Range = Highest Number - Lowest Number

Range = 11 - 2 = 9

Correct option: B
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Question 35
A
3.9
B
4.9
C
5.9
D
6.9
Explanation
\(\begin{array}{c|c} x & (x - \varkappa) & (x - \varkappa)^2 \\ \hline 2 & -5 & 25 \\ \hline 3 & -4 & 16 \\ \hline 8 & 1 & 1 \\ \hline 10 & 3 & 9 \\ \hline 12 & 5 & 25 \\ \hline & & 76
\end{array}\)

S.D = \(\sqrt{\frac{(x - \varkappa)^2}{n}}\)

S.D = \(\sqrt{\frac{76}{5}}\)

S.D = 3.9

Correct option: A
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Question 36
A
\(\sqrt{13}\)
B
\(3\sqrt{2}\)
C
\(\sqrt{26}\)
D
\(10\sqrt{5}\)
Explanation
P1 (4, 3), P2 (x, y)

y = 2x + 4 .....(1)

y = 7 - x .....(2)

Substitute (2) in (1)

7 - x = 2x + 4

7 - 4 = 2x + x

3 = 3x

x = 1

Substitute in eqn (2)

y = 7 - x

y = 7 - 1

y = 6

P2 (1, 6)

Distance between 2 points is given as

D = \(\sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2}\)

D = \(\sqrt{(1 - 4)^2 + (6 - 3)^2}\)

D = \(\sqrt{(-3)^2 + (3)^2}\)

D = \(\sqrt{9 + 9}\)

D = \(\sqrt{18}\)

D = \(\sqrt{9 \times 2}\)

D = \(3\sqrt{2}\)

Correct option: B
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Question 37
A
3630
B
3360
C
1120
D
560
Explanation
\(\frac{n + 1 (n - 2)}{(n + 1)!}\)

\(\frac{(n + 1) + (n - 2)!(n - 2)!}{(n + 1)!}\)

\(\frac{(n + 1)(n + 1 -1)(n+1-2)(n+1-3)!}{3!(n-2)!}\)

\(\frac{(n + 1)(n)(n-1)(n-2)!}{3!(n-2)!}\)

\(\frac{(n + 1)(n)(n-1)}{3!}\)

Since n = 15

\(\frac{(15 + 1)(15)(15-1)}{3!}\)

\(\frac{16 \times 15 \times 14}{3 \times 2 \times 1}\)

= 560

Correct option: D
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Question 38
A
6720
B
6270
C
6207
D
6027
Explanation
\(\frac{8!}{3!}\)

\(\frac{8 \times 7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1}{3 \times 2\times 1}\)

==> 8 x 7 x 6 x 5 x 4 = 6720

Correct option: A
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Question 39
A
\(\frac{2}{27}\)
B
\(\frac{3}{27}\)
C
\(\frac{4}{27}\)
D
\(\frac{5}{3}\)
Explanation
Pass(P) = \(\frac{2}{3}\), Fail(F) = \(\frac{1}{3}\)

T = P.P.F ==> \(\frac{2}{3} \times \frac{2}{3} \times \frac{1}{3}\) = \(\frac{4}{27}\)

Correct option: C
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Question 40
A
\(\frac{2}{15}\)
B
\(\frac{3}{15}\)
C
\(\frac{7}{15}\)
D
\(\frac{13}{15}\)
Explanation
Man lives = \(\frac{2}{3}\) not live = \(\frac{1}{3}\)

Wife lives = \(\frac{3}{5}\) not live = \(\frac{2}{5}\)

\(P(\frac{2}{3} \times \frac{2}{5}) + (\frac{2}{5} \times \frac{1}{3}) + (\frac{2}{3} \times \frac{3}{5})\)

= \(\frac{4}{15} + \frac{3}{15} + \frac{6}{15}\)

= \(\frac{13}{15}\)

Correct option: D

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