Jamb Mathematics Past Questions For Year 1981
Question 26
simplify \(\frac{6^{2n + 1} \times 9^n \times 4^{2n}}{18^n \times 2^n \times 12^{2n}}\)
- A. 32n
- B. 3 x 23n - 1
- C. 2n
- D. 6
- E. 1
Question 27
The number 25 when converted from the tens and units base to the binary base (base two) is one of the following
- A. 10011
- B. 111011
- C. 111000
- D. 11001
- E. 110011
Question 28
Evaluate \(\frac{6.3 \times 10^5}{8.1 \times 10^3}\) to 3 significant fiqures
- A. 77.80
- B. 778.0
- C. 7.870
- D. 8.770
- E. 88.70
Question 29
The positive root of t in the following equation, 4t\(^2\) + 7t - 1 = 0, correct to 4 places of decimal, is
- A. 1.0622
- B. 10.6225
- C. 0.1328
- D. 0.3218
- E. 2.0132
Question 30
The difference between the length and width of a rectangle is 6cm and the area is 135cm2. What is the length?
- A. 25cm
- B. 18cm
- C. 15cm
- D. 24cm
- E. 27cm
