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ICSE-VIII-Mathematics

23: Probability Class 8 Maths

with Solutions - page 2
Qstn# 12 Prvs-QstnNext-Qstn
  • #12
    Three identical coins are tossed together. What is the probability of obtaining:
    all heads?
    exactly two heads?
    exactly one head?
    no head?
    Ans : Total outcomes = 8
    i.e., (H, H, H), (H, H, T), (H, T, H), (T, T, T), (T, H, H), (T, T, H), (H, T, T), (T, H, T)
    (i) Favourable outcome = i.e., (H, H, H)
    ∴ P (of getting all heads) = 1/8
    (ii) Favourable outcome = 3 (H, H, T), (H, T, H), (T, H, H)
    ∴ P(E) = 3/8
    (iii) Favourable outcome = 3 (H, T, H), (T, T, H), (H, T, T)
    ∴ P(E) = 3/8
    (iv) Favourable outcomes = 1 i.e., (T, T, T)
    ∴ P(E) = 1/8