Let S be a finite set of consecutive multiples of 7. How many terms are there in S? (1) The sum of the terms in set S

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Let S be a finite set of consecutive multiples of 7. How many terms are there in S?

(1) The sum of the terms in set S is 105.
(2) The standard deviation of set S is equal to 3.5


OA B

Source: Princeton Review