Wiskunde Multiple Choice Vraag uit Gricha's Wiskundige Vragenbank

1 + 2 + 3 + 4 + ... + n is gelijk aan	A. $https://latex.codecogs.com/png.image?\large \dpi{110}C_{n+1}^{\: 2}$
	B. $https://latex.codecogs.com/png.image?\large \dpi{110}C_{n}^{\: 2}$
	C. $https://latex.codecogs.com/png.image?\large \dpi{110}V_{n}^{\: 2}$
	D. $https://latex.codecogs.com/png.image?\large \dpi{110}V_{n+1}^{\: 2}$
	E. $https://latex.codecogs.com/png.image?\large \dpi{110}P_n$

[ 6-2878 - op net sinds 29.3.13-(E)-30.10.2023 ]

$\large \color{DarkGreen} { 1+2+3+4+\cdots +n=\frac{1}{2}\cdot n\cdot (1+n)=\frac{(n+1)\cdot n}{2}=C_{n+1}^{\: 2} }$