Maximum Number of Subscribers in single channel of pubnub

For the group chat and single chat we are using pubnub.

what is the maximum number channels a single client can subscribe

I searched for this and got this below.

http://ift.tt/2hKlDmq

A single client may only subscribe to 50 channels at one time (with standard Mutliplexing). Using Channel Groups, a single client can subscribe to 10 channels and each channel group may contain up to 2000 channels.

In that is client can subscribe only 50 channels or among all those only 50 channels are in active state?

we are not using channel groups.

we are using group chat in this manner

for group chat : group_21, group_25 for user chat : user_5, user_9