Answers

2015-07-01T20:11:25+05:30
x={x:xbelong to Z which when divided by 42 leaves the reminder of 0
ihope you understand the meaning of (belongs to)
0
2015-07-01T21:55:58+05:30
{x:x N and x is divisible by 2,3 and 7}.
1 5 1