Business Mathematics
231. If A and B are two sets containing respectively m and n distinct elements. How many different relations can be defined for A and B?
- 2mn
- 2m+n
- 2m-n
- 2m/n
Correct answer: (A)
2mn
232. A set is known by its ____________________.
- Values
- Elements
- Letters
- Members
Correct answer: (B)
Elements
233. Find the Harmonic Mean between 2/3 and -4/3.
- 8/3
- 16/3
- -8/3
- -16/3
Correct answer: (A)
8/3
234. If log10 2 = 0.3010, then log2 10 is equal to:
- 0.6990
- 1000/301
- 699/301
- 0.3010
Correct answer: (B)
1000/301
235. The value of (1+ i)(1 +i2)(1+i3)(1+ )
- 2
- 0
- 1
- i
Correct answer: (B)
0
236. If θ is the amplitude of (a + ib) / (a – ib), then tan θ=
- 2a / a2 + b2
- (a² - b2) / (a2 + b2)
- 2ab / ( a2 - b2)
- None of these
Correct answer: (C)
2ab / ( a2 - b2)
237. The reciprocal of a negative rational number is
- Positive
- 0
- 1
- Negative
Correct answer: (D)
Negative
238. The twentieth term of √2, 3√2, 5√2, 7√2, … is
- 28√2
- 19√2
- 30√2
- 39√2
Correct answer: (D)
39√2
239. If the second term of G.P. is 2 and the sum of its infinite terms is 8, then its first term is
- 1 / 4
- 1 / 2
- 2
- 4
Correct answer: (D)
4
240. 4 √5 + 6√5 + ½√5 =
- 23 / 2√5
- 12√5
- 21/2√5
- 2 / 3 √5
Correct answer: (C)
21/2√5