It is known that 2u3 = 2 + 3 + 4; 7u2 = 7 + 8; 3u4 = 3 + 4 + 5 + 6 According to this rule, if nu8 = 68, then n =? How does the formula come out,

It is known that 2u3 = 2 + 3 + 4; 7u2 = 7 + 8; 3u4 = 3 + 4 + 5 + 6 According to this rule, if nu8 = 68, then n =? How does the formula come out,

nU8=68
Then n + (n + 1) + (n + 2) + +(n+7)=68
8n+(1+2+…… +7)=68
8n+28=68
n=5