एक बैग में समान आकृति के तीन सफेद और चार काले गेंद है यदि एक व्यक्ति एक बार में केवल 2 गेंद निकालता है तो दोनों गेंदों की सफेद होने की प्रायिकता ज्ञात कीजिए!
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Answer :
- 1 bag have 4 black balls
- also 3 white balls
- Total balle = 7 balls
- if person take two balls in one draw
- question is for without replacement
- find answer for two with balls selection
- number of ways for selecting any two balls = 7C2 = 21
- number of ways for selecting white balls = 3C2 = 3
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