Question
A speaks the truth 4 out of 7 times and B speaks truth 8
out of 9 times. What is the probability that they contradict each other in stating the same fact?Solution
P (A truth) = Probability that A speaks the truth =4/7 P (A lie) = Probability that A lies = 1 - P (A truth) =1-4/7 =3/7 P (B Truth) = Probability that B speaks the truth = 8/9 P (B lie) = Probability that B lies = 1- P (B truth) = 1-8/9 =1/9. 
What will come in place of the question mark (?) in the following series?
1528, 1416, 1204, ?, 480, -32
143 Â Â Â Â 119Â Â Â Â 107Â Â Â Â 101Â Â Â Â Â 98Â Â Â Â ?
96 89 ? 90 94 91
...What value should come in the place of (?) in the following number series?
19, 235, 260, 324, 333, ?
What will come in place of the question mark (?) in the following series?
305...
In each of the following number series, one term is missing. Find the missing term.
3, 5, 20, 24, 144, 150, ?
1029, 1030, 1039, 1064, ?, 1194
75, 80, 95, ?, 155, 200
What will come in place of the question mark (?) in the following series?
1515, 184, ?, 455, 967, 624
7 29 61 ? 211 349
...
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