EM-1490

Number patterns and the nth term

E Math · Secondary 4 · Medium · Number patterns and the nth term

A sequence has first three terms

U_1 = \frac12(3\times 4)=6

U_2 = \frac12(4\times 5)=10

and

U_3 = \frac12(5\times 6)=15

.
Find

U_6

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