I don't remember the quick way of solving this. does it have to do with the nCr formula? i think there's another way besides drawing out the possibilities
2007-07-25 06:33:34 · 4 answers · asked by azngirlzda1 2 in Science & Mathematics ➔ Mathematics
oh yea, the answers 3/8
2007-07-25 06:36:02 · update #1
Well you have 8 possible out comes (2 * 2 * 2). Out of those 8 possible outcomes, three involve 2 heads (the 1st and 2nd, the 2nd and 3rd, and the 1st and 3rd being heads). So the probability is 3/8ths.
2007-07-25 06:36:59 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Pascals triangle is the fast method. Or we can use the binomial theorem (p + q)3 where p is the probability of heads and q that of tails. The coefficient before p^2 term is the probability.
2007-07-25 06:39:21 · answer #2 · answered by Swamy 7 · 0⤊ 0⤋
see take the ample space of xperiment.it is 8{hhh,htt,hht,hth,ttt,thh,tht,tth}so the answer is 3/8 as thr r three favorable outcomes.
else use binomial distribution.
let p=probability of getting 1 head in one toss=1/2.
thrfore q=probability of gettong tale in one toss=1/2
now for getting xactly two heads,probability=3C2p^2q^1=3/8.
thr r more methods to do this question.But i think these shud suffice
2007-07-25 06:39:54 · answer #3 · answered by aviral17 3 · 0⤊ 0⤋
yes is this some problem u r reviewing w/ for next yr.??!!
2007-07-25 06:41:18 · answer #4 · answered by WOW 4 · 0⤊ 1⤋