

nC5=nCn-5=nC0 N-5=0
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First place can be filled in 5 ways as 0 cannot come. Also all digits have to be used so remaining 5 places can be filled by 5! Ways hence 5*5! = 600 ways
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Required Probability : (5C2 + 5C0) / 10C2
= 10/45
= 2/9
total weight of awards=2.75;weight of trophy=1.275
Weight of awards given to 11 members = (2.75- 1.275) = 1.475 kg
Weight of award given to each member = (1.475/11) = 134 grams
Possible Values of a=29, and b=27
2ab-3a = 1566-87 = 1479