2. In the visual pattern below, the number of squares in each pattern forms a sequence. Which of the following four sequence definitions properly model the number of squares, s,? n=1 n = 2 n = 3 n= 4 I s, =3n+7 II. s, = 3n+4 III. S =7 and s, =s-1 +3 IV. s =7 and s, =s-1+n (1) I and III (3) П аnd IV (2) П and Ш (4) I and IV

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