I have two SC Questions.
Could you please give elaborate explanations.
[Deleted because this question is from a banned source - see below. Please read (and follow!) the forum guidelines before posting. 1000SC is a banned source because it illegally uses copyrighted problems without permission. (And, even if it didn't, we'd ban it anyway - a lot of the problems in the set are fine, but there are a number of bad ones that can actually mess up your study if you use them!)]