PROBABILITY (प्रायिकता) Tricks for BANK PO (Concept for ALL BANK PO EXAM + SBI PO)in Hindi,prayikta concept

permutations and combinations PART 1:https://www.youtube.com/edit?o=U&video_id=9f0-Fx8GGeQ

https://www.youtube.com/edit?o=U&video_id=Wf5tu5Q-ULw

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