Sum of Squares of n Natural Numbers

Q.

Find the sum of the squares of the first 9 natural numbers.

1. 185

2. 385

3. 285

4. 485

Q. $5^2+{10}^2+{15}^2+...+{100}^2=$ ___

1. 67750
2. 8250
3. 17500
4. 71750

Q. ${15}^2+{20}^2+{25}^2+...+{100}^2=$

1. 71220
2. 71625
3. 71750
4. 71800

Q. The sum of the squares of the first $n$ natural numbers is given by $\frac{n(n+1)(2n+1)}{2}.$

1. False
2. True

Q. $1^2+2^2+3^2+4^2+...+7^2=$ .

1. 120
2. 140
3. 105

Q.

Find the sum of the squares of the first 9 natural numbers.

1. 185

2. 385

3. 285

4. 485