As Jelo said, randomization doesn't work like this...
If you have a random number between of either 1 or 2, for each draw there is a 50% chance to get one or the other. However, it does not mean that at the end you will have 50% "1" and 50% "2", this is not how chance works.
The larger the number of draws, the closer to a 50/50 distribution you should get, but it hardly ever is 50/50. n=10 is definitely not a large number and even n=100 I wouldn't consider a large number. With n=1000 chances are night that you get relatively close to a 50/50 distribution. Important is the word "close".
If you need 50 in one and 50 in another case, it is best to follow Jelos recomendation of distributing the case for each participant beforehand in the token table as custom attribute. But even there is no guarantee that you will end up with 50 for each case, only if really everyone of the sample answers.
If you have a random number between of either 1 or 2, for each draw there is a 50% chance to get one or the other. However, it does not mean that at the end you will have 50% "1" and 50% "2", this is not how chance works.
The larger the number of draws, the closer to a 50/50 distribution you should get, but it hardly ever is 50/50. n=10 is definitely not a large number and even n=100 I wouldn't consider a large number. With n=1000 chances are night that you get relatively close to a 50/50 distribution. Important is the word "close".
If you need 50 in one and 50 in another case, it is best to follow Jelos recomendation of distributing the case for each participant beforehand in the token table as custom attribute. But even there is no guarantee that you will end up with 50 for each case, only if really everyone of the sample answers.