1,656.
What is the probability that the surname of a child picked at random from the class begins with either O or A?
A.
5/8
B.
7/8
C.
9/16
D.
14/25
E.
39/40
Correct answer is A
No. of possible outcome = 40
No. of expected outcome = 16 + 9 = 25
Probability = 25/40 = 5/8
1,657.
If Q = (all perfect squares less than 30) and P = (all odd numbers from 1 to 10). Find Q ∩ P.
A.
(1, 4, 9, 16, 25)
B.
(1, 3, 4, 5, 7, 9, 16, 25)
C.
(1, 3, 5, 7, 9)
D.
(1, 9)
E.
Φ
Correct answer is D
Q = {1, 4, 9, 16, 25} P = { 1, 3, 5, 7, 9}
Q ∩ P = { 1, 9}
1,659.
A.
135o
B.
105o
C.
90o
D.
75o
E.
60o
Correct answer is D
ΔRPS = Isosceles triangle
\therefore < RPS = \frac{180° - 90°}{2}
= 45°
In \Delta QPR,\sin < QPR = \frac{1}{2}
= 30°
\therefore < QPS = 30° + 45° = 75°
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