Using That or Which
That and which can both be used to introduce a relative clause that gives additional information about a place, thing, or idea.
The relative pronoun that introduces necessary information about things, people, places, and ideas. It introduces a restrictive clause. The meaning of the sentence would change if that clause is taken out.
The relative pronoun which introduces unnecessary information about things, places, and ideas. It introduces a nonessential clause. The meaning of the sentence does not change if that clause is taken out—the clause is providing extra information.
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Help
The correct answer is
Remember :
The smallest number is the one that comes first while counting.
Solution :
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21,27,23
21 is the smallest number.