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Originally Posted by Meggieski
I got the first one but need explanation on second. I kind of see why it is 90 but wouldn't have come up with that on myself. A clear explaination would help very much!
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That is because interchanging the position of same type of commercials doesn't generate a new sequence and hence those need to be taken out from the final count.
for example "aA BB CC" and "Aa BB CC" should be counted only once and not twice. Hope this makes it clear.