A set of six balls bowled in cricket - is called an 'over'.
If there are no extras, then only 30 balls will be bowled. If there are extras, more balls will be bowled depending on the number of extras.
highestly9 balls per over has been bowled in one day cricket.
Overs means number of balls bowled or going to bowl against opposite team.
By illegitimate, I presume you refer to a no-ball or a wide. Under current rules an over contains 6 balls. Some years back, 8-ball overs were used in Australia if nowhere else. For an over to be complete, 6-balls not including a wide or no-ball must be bowled. If an illegitimate ball is bowled, it must be rebowled. The most illegitimate balls bowled in one over was an over bowled by Curtly Ambrose in his final test on Australian soil which contained 9 no-balls - a total of 15 balls.
3
balls bowled divided by wickets
Six
6
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Inzmam ul Haq is the batsman who scored lowest score in test with highest number of balls. 1 run in 35 balls against India.
There are six legal balls bowled in one over, meaning that their has to be six balls which are not deemed to be no balls or wides.