an = (4n+3)/2
a1 = (4*1+3)/2 = (4+3)/2 = 7/2 = 3,5
a2 = (4*2+3)/2 = (8+3)/2 = 11/2 = 5,5
a3 = (4*3+3)/2 = (12+3)/2 = 15/2 = 7,5
a3-a2 = a2-a1
7,5-5,5 = 5,5-3,5
2 = 2
Jest to ciąg arytmetyczny
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an = (4n+3)/2
a1 = (4*1+3)/2 = (4+3)/2 = 7/2 = 3,5
a2 = (4*2+3)/2 = (8+3)/2 = 11/2 = 5,5
a3 = (4*3+3)/2 = (12+3)/2 = 15/2 = 7,5
a3-a2 = a2-a1
7,5-5,5 = 5,5-3,5
2 = 2
Jest to ciąg arytmetyczny