Online Math
14/10/2017 at 10:51-
1 + 2 + 3 + 4 + ... + 198*23
\(=\left(1+2+3+4+...+197\right)+198\cdot23\)
\(=\left(197+1\right)\dfrac{197-1+1}{2}+4554\)
\(=19503+4554=24057\)
Selected by MathYouLike
1 + 2 + 3 + 4 + ... + 198*23
\(=\left(1+2+3+4+...+197\right)+198\cdot23\)
\(=\left(197+1\right)\dfrac{197-1+1}{2}+4554\)
\(=19503+4554=24057\)
Selected by MathYouLike