Question
Anna is participating in a trivia game with 6 questions,
each with 3 choices. Only one choice is correct per question. If Anna guesses on all questions, what is the probability that she gets exactly 3 correct?Solution
ATQ, Probability of a correct guess = 1/3 Probability of an incorrect guess = 2/3 Number of ways to choose 3 correct answers out of 6 = (6/3) = 20 So, the required probability = 20 × (1/3)3 × (2/3)3 = (20×1×8)/(27×27) = 160/729
If tanθ = x then find the value of cos 2θ?
sin2 7 ° + sin2 8 ° + sin2 9 ° + sin2 10 ° + ……… + sin2 83 ° = ?
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sin2 7Ëš + sin2 9Ëš + sin2 11Ëš + sin2 12Ëš + ……… + sin2 83Ëš = ?
What is the value of [(sin x + sin y) (sin x – sin y)]/[(cosx + cosy) (cosy – cosx)]?
The value of (3tan10°-tan³10°)/(1-3tan²10°) is equal to
If 2x = cosec @ and 4/x = cot @ then the value of 2(x ² - 1/x ² ) is
If cosec (2A + B) = 2 and cosec (A + B) = 1, find the value of (3A – B).
tan 1˚ × tan 2˚× …………………….tan 88˚ × tan 89˚ = ?
If (sinθ+cosθ)/(sinθ-cosθ) = 2, then the value of sin4 θ is
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