Question 1157158
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            I will answer part  (iii)  only.



<pre>
The class consists of 12 male    = 3 non-B + 9 other male


                 and  18 females = 5 non-B + 13 other females.


The probability of selecting either a male or a non-B student = {{{(12 + 5)/(12 + 18)}}} = {{{17/30}}}.    <U>ANSWER</U>
</pre>

Solved.


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The formulas and the presentation itself are &nbsp;SELF-EXPLANATORY, &nbsp;i.e. &nbsp;do not require additional explanations.


The presentation itself is extremely compact and clear, &nbsp;making any additional words unnecessary.


Please post me, &nbsp;WHAT &nbsp;DO &nbsp;you &nbsp;THINK &nbsp;about it. &nbsp;&nbsp; Is it clear to you ?


I hope that after reading this post, you will tackle such problems as 2 x 2 = 4.