How good are you with figures and formulas? Find out with these Mathematics past questions and answers. This Test is useful for both job aptitude test candidates and students preparing for JAMB, WAEC, NECO or Post UTME.
If 2257 is the result of subtracting 4577 from 7056 in base n, find n
8
9
10
11
Correct answer is A
\(\begin{array}{c|c} 7056 \\ \text{- 4577} \\\hline 2257 \end{array}\)
By trial and error method
Let the base to 8
i.e. Let n = 8 and it is easily verified that the subtraction holds.
The subtraction does not hold when other values of n are tried
n = 8
Simplify 3\(\frac{1}{3}\) - 1\(\frac{1}{4}\) x \(\frac{2}{3}\) + 1\(\frac{2}{5}\)
2
3
4
5
Correct answer is C
3 - \(\frac{1}{3}\) - (\(\frac{5}{4}\) x \(\frac{2}{3}\)) + 1\(\frac{2}{5}\)
= \(\frac{10}{3}\) - \(\frac{5}{6}\) + \(\frac{7}{5}\)
= \(\frac{100 - 25 + 42}{30}\)
= \(\frac{117}{30}\)
= 3.9
\(\approx\) 4
48
12
10
7
Correct answer is B
Mathematics = \(^{4} C_{3} = 4\)
Physics = \(^{3} C_{2} = 3\)
\(\therefore\) He can choose in 4 x 3 = 12 ways.
48
24
20
10
Correct answer is B
= \((n - 1)!\) ways.
= \((5 - 1)! \) ways
= 24 ways.
\(\frac{1}{96}\)
\(\frac{1}{8}\)
\(\frac{5}{6}\)
\(\frac{11}{12}\)
Correct answer is D
Prob of P = \(\frac{3}{4}\)
Prob of Q = \(\frac{1}{6}\)
Prob of both P or Q = \(\frac{3}{4} + \frac{1}{6} = \frac{11}{12}\)