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4 = 1² + 3
7 = 2² + 3
12 = 3²+3
19 = 4² + 3
Jadi Rumus :
Un = n²+3
a=4
b=u2-u1=7-4
=3
dit rumus ke-n?
jawab
Un=a+(n-1) .b
Un=4+(n-1) .
Un=4+4n-3
Un=1+3n
maaf kalo salah