Question
Maria is taking a quiz that contains 3 questions, each
with 5 options. Only one option is correct for each question. If Maria guesses all the answers, what is the probability that she will get exactly 2 questions correct?Solution
ATQ, Probability of guessing the right answer for each question = 1/5 Probability of guessing the wrong answer for each question = 4/5 The probability of getting exactly 2 questions correct involves Maria guessing 2 right and 1 wrong. This can happen in (3/2) = 3 different ways So, required probability = 3 × (1/5 × 1/5 × 4/5) = 12/125
- Find the wrong number in the given number series.
8, 14, 24, 49, 59, 84 Find the wrong number in the given number series.
8, 12, 23, 40, 66, 103
174 180 198 252 414 910
640 1920 240 720 92 270
Find the wrong number in the given number series.
132, 147, 138, 155, 144, 161
1 3 7 15 33
...Find the wrong number in the given number series,
9, 60, 299, 1199, 3599, 7199
- Find the wrong number in the given number series.
32.6, 36.4, 40.2, 43.6, 47.8, 51.6 11 110 978 6824 34103 102290
- Find the wrong number in the given number series.
12, 21, 5, 38, 2, 71
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