Question

If two coins are tossed, then find the probability of the event: No heads turns up.

Answer 1

Since two coins are tossed.

∴ S = {HH, HT, TH, TT}

∴ n(S) = 4

Let A ≡ Event of getteing no head

∴ A ≡ {TT}

∴ n(A) = 1

∴ P(A) = `("n"("A"))/("n"("S")) = 1/2`

∴ P(A) = `1/4`

∴ The probabil;ity of grtting no head turns up is `1/4`