tentukan U⁴ dari pola bilangan segitigaTOLONG JAWABANYA KAKAPAKE CARA X K.... Question from @lilatania

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$\underline{\bf{Rumus~Pola~Bilangan~Segitiga}} \\ \boxed{ \rm{u_{n} = \frac{1}{2} \times n \times (n + 1) }}$

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$\begin{gathered} \boxed{ \boxed{ \begin{aligned} \underline{ \blue{ \sf{Mencari ~U_4}}} \\ \sf{u_n = \frac{1}{2} \times n \times (n + 1)} \\ \\ \sf{u_4 = \cancel{\frac{1}{2}} \times \cancel{4} \times (4 + 1)} \\ \sf{ = 2 \times 5} \\ \sf{ = \underline{ \red{ \sf{10}}}}\end{aligned}}} \end{gathered}$

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