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50 people will be kept in 3 groups where all group are consisted of the number of people equivalent to prime number.

So, 1st way is = 2 +5+43 = 50 

2nd way is = 2 +7+41 = 50

3rd way is = 2 +11 + 37 = 50 

4th way is = 2 +17 +31 = 50

5th way is = 2 +19 +29 = 50 

(ans.) 5 ways.

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