Mathematics | Study Mode

Question 1
A
-45
B
-15
C
15
D
33
E
45
Explanation.

T$$_{2}$$ = ar = 6

T$$_{5}$$ = ar$$^{4}$$ = 48

$$\frac{T_5}{T_2}$$ = $$\frac{ar^{4}}{ar}$$ = $$\frac{48}{6}$$

= r$$^{3}$$ = 8

r = 2

S$$_{n}$$ = $$\frac{a((r^n) - 1)}{r - 1}$$

S$$_{4}$$ = $$\frac{a((r^4) - 1)}{r - 1}$$

S$$_{4}$$ = $$\frac{3((2^4) - 1)}{2 - 1}$$

= 3(16 -1)

= 45

Question 2
A
1-K
B
$$\frac{k}{k - 1}$$
C
$$\frac{k}{\sqrt{1 - k^2}}$$
D
$$\frac{k}{1 - k}$$
E
$$\frac{k}{\sqrt{ k^2 - 1}}$$
Explanation.

No official Explanation yet!

Question 3
A
B
2.02
C
20.02
D
202
E
2020
Explanation.
(101.5)2 - (100.5)2;(101.5 + 100.5)

202 x 1

= 202

Question 4
A
5.4 * 10-1
B
5.4*10-2
C
5.4*10-3
D
5.4*102
E
5.4*103
Explanation.
0.06 x 0.09 = 0.0054

= 5.4 x 10-3

Question 5
A

0

B
1\24
C
2/3
D
11/3
E
71/2
Explanation.

No official Explanation yet!

Question 6
A
13
B
11
C
-8
D
-11
E
-17
Explanation.
Un = a + (n-1)d
= -3 + (8 - 1)2
= 11

Question 7
A
B
C
D
E
Explanation.
The mode=4. It has the highest frequency of 7

Question 8
A
1.75
B
C
2.5
D
2.75
E
Explanation.

No official Explanation yet!

Question 9
A
B
2.5
C
D
E
Explanation.

No official Explanation yet!

Question 10
A
30o
B
120o
C
150o
D
210o
E
300o
Explanation.
cos60o = 1/2, cos(180o/60o) = -1/2

cos120o = -1/2

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