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maka 1(1+1)+(2(2+1))+(3(3+1))+(4(4+1))
40
nomor 4 jumlahkan dari n1sampai 3
maka
3.1^2+4.1+5+(3.2^2+4.2+5)+(3.3^2+4.3+5)
maka 12+ 25 +44
81
Nomor 4