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Let us know see the possible groups -
1. 3+3+2+0
No. of ways = 4!/2! = 12
2. 3+3+1+1
No. of ways = 4!/(2!)(2!) = 6
3. 3+2+2+1
4. 2+2+2+2
No. of ways = 4!/4! = 1
So, the total no. of possible ways = 12+6+12+1
= 31 Answer.
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