1) Convert 1126
to a number in base three
- A. 2211
- B. 2121
- C. 1212
- D. 1122
View Correct Answer
Correct Answer: Option D
Explanation
First, convert to base 10
1126
= (1 x 62) + (1 x 61) + (2 x 60)
= 36 + 6 + 2
= 4410
then convert the answer to base 2
Ans = 1122 = D
2) Evaluate 21/9 to 3 significant figures
- A. 2.30
- B. 2.31
- C. 2.32
- D. 2.33
View Correct Answer
Correct Answer: Option D
Explanation
219=73
">21/9=7/3
= 2.33 (to 3 sig. figs)
3) A man earns N3,500 per month out of which he spends 15% on his children’s education. If he spends additional N1,950 on food, how much does he have left?
- A. N525
- B. N1,025
- C. N1,950
- D. N2,975
View Correct Answer
Correct Answer: Option B
Explanation
Amount spent on children = 15100×3500=N525
Amount spent = Amount on children + Additional amount on food
Amount Spent = N525 + N1950 = N2475
Therefore amount left = N3,500 - N2,475 = N1,025
4) If P is a set of all prime factors of 30 and Q is a set of all factors of 18 less than 10, find P ∩ Q
- A. {3}
- B. {2,3}
- C. {2,3,5}
- D. {1,2}
View Correct Answer
Correct Answer: Option B
Explanation
P = {2,3,5}
Q = {2,3,6,9}
P ∩ Q = {2,3}
5) In a class of 46 students, 22 play football and 26 play volleyball. If 3 students play both games, how many play neither?
- A. 1
- B. 2
- C. 3
- D. 4
View Correct Answer
Correct Answer: Option A
Explanation
n(f ∩ v) + n(f) + n(v) + n(f ∩ v) = 46
3 + 19 + 23 + x = 46
22 + 23 + x = 46
45 + x = 46
x = 46 - 45
x = 1
