Answers

2015-03-16T19:59:56+05:30
2, 3, 5, 7, 11, 13, 17, 19, 23, 29.
and 29 it gretest in this so it is gretest prime

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2015-03-16T19:59:58+05:30

29 is the largest prime number before 30.It has no other multiples other than 1 and itself.
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2,3,7,9,11,13,17,19,23,29
the answer is 29