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10-6 = 4
15-10= 5
(selisih antar suku selalu bertambah 1)
dst.
jadi deretnya menjadi 3,6,10,15,21,28,36,45,...
Suku ke 7 nya 36
3 4 5 6 7 8
barisan tersebet selalu naik 1 tingkat