Question Type 4: Find the sum of the first n terms given the first term and the common difference Exercises

Find the sum of the first $20$ terms of the arithmetic sequence with $u_1 = 7$ and $d = 0$.

Find the sum of the first $3$ terms of the arithmetic sequence with $u_1 = 3$ and $d = 3$.

Find the sum of the first $6$ terms of the arithmetic sequence with $u_1 = 3$ and $d = 8$.

Find the sum of the first $10$ terms of the arithmetic sequence with $u_1 = 5$ and $d = 2$.

Find the sum of the first $9$ terms of the arithmetic sequence with $u_1 = -4$ and $d = 7$.

Find the sum of the first $20$ terms of the arithmetic sequence with $u_1 = 50$ and $d = 5$.

Find the sum of the first $8$ terms of the arithmetic sequence with $u_1 = 12$ and $d = -3$.

Find the sum of the first $5$ terms of the arithmetic sequence with $u_1 = 100$ and $d = -10$.

Find the sum of the first $15$ terms of the arithmetic sequence with $u_1 = 0$ and $d = 5$.

Find the sum of the first $30$ terms of the arithmetic sequence with $u_1 = -10$ and $d = 2$.

Find the sum of the first $12$ terms of the arithmetic sequence with $u_1 = 2.5$ and $d = 1.5$.

Find the sum of the first $100$ terms of the arithmetic sequence with $u_1 = 1$ and $d = 4$.