Explain it

Explain it (ttuoe not conuocutivo) - 190 • Q. 20 While shuffling a pack of 52 playing cards, 2 are accidentally dropped. Find the probability that the missing cards to be of different colours. 29 (a) 52 26 (d) 2 Sol.(c) Since,in a back ot 52 cards 26 aro rod colour and 26 aro black colour 26 26 26 26 P (both cards of opposite colour) 26 26 26 Q. 21 If seven persons are to be seated in a row. Then, the probability that two particular persons sit next to each other is

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