couple drawing part 2 #shorts

There are 15 couples taking part in a single tournament , the number of ways in which they can be paired such that no two real lives couple play in the same team is

Draw a labelled diagram to show the multiple reflections of sound in a part of the stethoscope tube.

If a married couple invites 7 couples for a dinner party and they all are to be seated around a round tablesuch that members of same couple are at maximum distance,then number of ways in which they can be seatedare 2^(a). then 'a' is equal to

5couples are sitting at a round table out of which at least 4 couples are together than the probability that all 5 couples are together is given by

Coupling Reaction 2

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