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नौवीं कक्षा के 30 विद्यार्थी के रक्त समू...

नौवीं कक्षा के 30 विद्यार्थी के रक्त समूह को नीचे अंकित किया गया है ,
`{:("A, B, O, AB, O, O, A, O, B, A, O, B, A, O, O,"),("A, AB, O, A, A, O, O, AB, B, A, O, B, A, B, O,"):}`
एक विद्यार्थी रक्तदान के लिए कक्षा से चुना जाता है। प्रायिकता ज्ञात कीजिए कि चुने गए विद्यार्थी का रक्त समूह
(i) A है।
(ii) B है।
(iii) AB है।
(iv) O है।

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