That is a dual-channel platform.
The memory is marketed as "triple-channel" because it comes in packs of three
So It will run on a SINGLE channel with this configuration?
Intel platforms use channel-interleaved memory addressing. The first 16GiB will be dual-channel interleaved, while the third 8GiB will be single channel. This is of course assuming that the notebook doesn't have additional memory soldered to the motherboard as is sometimes the case