1. $1^2+2^2+3^2+.....+x^2$

• A. $\frac{x\left(x+1\right)\left(2x+1\right)}{6}$
• B. $\frac{x\left(x+1\right)\left(2x+1\right)}{6}$
• C. $\frac{x\left(x+1\right)\left(2x+1\right)}{6}$
• D. $\frac{x\left(x+1\right)\left(2x+1\right)}{6}$

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