Which of the following about a rhombus may not be true?
The diagonals are equal
The diagonals bisect the angles through which they pass
The diagonals bisect each other
The adjacent sides are equal
Opposite angles are equal
Correct answer is A
No explanation has been provided for this answer.
1/8
1/4
3/8
1/2
3/4
Correct answer is A
(1/2)(1/4) = 1/8
2/3
3/5
2/5
7/20
3/10
Correct answer is B
Total number of marbles = 5; 1st pick = 2/5 2nd pick = 3/4; 3rd pick = 3/5; 4th pick = 2/4
∴ Probability of picking two marbles of different colors = (2/5 x 3/4) + (3/5 + 2/4) = 12/20 = 3/5
If events X and Y are mutually exclusive, P(X) = 1/3 and P(Y) = 2/5, P(X∪Y) is
0
2/15
4/14
11/15
1
Correct answer is D
P(X \(\cup\) Y) = \(\frac{1}{3} + \frac{2}{5}\)
= \(\frac{11}{15}\)
If events X and Y are mutually exclusive, . P(X) = 1/3 and P(Y) = 2/5, P(X∩Y) is
0
2/15
11/15
4/15
1
Correct answer is B
P(X \(\cap\) Y) = \(\frac{1}{3} \times \frac{2}{5}\)
= \(\frac{2}{15}\)