Question

4 coins are tossed simultaneously. What is the probability of getting less than 2 tails?​

Answer 1

Sample space (S) = { HHHH, HHHT, HHTH, HHTT, HTHH, HTHT, HTTH, HTTT , THHH, THHT, THTH, THTT, TTHH, TTHT, TTTH, TTTT }

${n(S)\:=\:16}$

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${Let\:A\:be\:the\:Event\:of\:getting\:atleast\:2\:tails}$

${n(A)\:=\:4}$

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${p(A)\:=\:\frac{n(A)}{n(S)}}$

${p(A)\:=\:\frac{4}{16}}$

$\boxed{p(A)\:=\:\frac{1}{4}\:or\:0.25}$