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First let us find the amount of milk for one student = volume of cylinder of height 12 cm and diameter 7cm

V =  \pi  r^{2} h

=  \frac{22}{7} * 3.5^{2} * 12
=264 litres

One student is provided 264 litres.
So 100 students will be provided with = 264 * 1000 = 264000 litres.
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