Total = 30
2 did not take any
12 * 1 = 12
10 * 2 = 20
6 took at least 3 i.e >=3
avg = s/n
2 = s/30
S = 60 = total books
60 - 12 + 20 = 28
Say 5 students took 3 books each so 15 books
So max one can take is 28 -15 = 13
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