# Probability -$2$ on just one occasion.

A die is thrown three times. Show the probability of scoring a $2$ on just one occasion in the probability tree diagram.

My attempt

Please somebody check it. Is this correct? or are there any other alternatives?

• this m,ethod is inefficient. $\binom{3}{1}\frac{1}{6}^{1}\cdot\frac{5}{6}^2$ – SAJW Jan 21 '17 at 3:41
• But, I do need to draw the tree diagram as well – pi-π Jan 21 '17 at 3:42
• @ThomasAndrews fair enough – SAJW Jan 21 '17 at 3:43
• @NeWtoN your result is right, so i guess all is cool? – SAJW Jan 21 '17 at 3:43
• @Socrates, however the answer given in my book is $\frac {1}{8}$ – pi-π Jan 21 '17 at 3:44