Arithmetic sequences

Find $ S_{ 18 } $ ( sum of first $ 18 $ terms ) of arithmetic progression if $ a_1 = 325 ~~ \text{and} ~~ d = -15 $.

Find $ S_{ 35 } $ ( sum of first $ 35 $ terms ) of arithmetic progression if $ a_1 = 1000 ~~ \text{and} ~~ d = 1000 $.

Find $ S_{ 1000 } $ ( sum of first $ 1000 $ terms ) of arithmetic progression if $ a_1 = 1000 ~~ \text{and} ~~ d = 1000 $.

Find $ S_{ 32 } $ ( sum of first $ 32 $ terms ) of arithmetic progression if $ a_1 = 5 ~~ \text{and} ~~ d = 9 $.

Find $ S_{ 31 } $ ( sum of first $ 31 $ terms ) of arithmetic progression if $ a_1 = 78 ~~ \text{and} ~~ d = 1 $.

Find $ a_{ 57 } $ of an arithmetic progression if $ a_1 = 15 ~~ \text{and} ~~ d = 6 $.

Find $ a_{ 8 } $ of an arithmetic progression if $ a_1 = 2 ~~ \text{and} ~~ d = 1 $.

Find $ a_{ 2 } $ of an arithmetic progression if $ a_1 = 400 ~~ \text{and} ~~ d = 160 $.

Find $ a_{ 23 } $ of an arithmetic progression if $ a_1 = 30 ~~ \text{and} ~~ d = \left( -5 \right) $.

Find $ S_{ 70 } $ ( sum of first $ 70 $ terms ) of arithmetic progression if $ a_1 = 23 ~~ \text{and} ~~ d = 8 $.

Find $ S_{ 5 } $ ( sum of first $ 5 $ terms ) of arithmetic progression if $ a_1 = 30 ~~ \text{and} ~~ d = -\frac{ 1 }{ 5 } $.

Find $ a_{ 18 } $ of an arithmetic progression if $ a_1 = 5 ~~ \text{and} ~~ d = 14 $.

Find $ a_{ 19 } $ of an arithmetic progression if $ a_1 = 5 ~~ \text{and} ~~ d = 14 $.

Find $ a_{ 20 } $ of an arithmetic progression if $ a_1 = 5 ~~ \text{and} ~~ d = 14 $.

Find $ S_{ 10 } $ ( sum of first $ 10 $ terms ) of arithmetic progression if $ a_1 = 4 ~~ \text{and} ~~ d = 7 $.

Find $ a_{ 12 } $ of an arithmetic progression if $ a_1 = 250 ~~ \text{and} ~~ d = 250 $.

Find $ S_{ 12 } $ ( sum of first $ 12 $ terms ) of arithmetic progression if $ a_1 = 250 ~~ \text{and} ~~ d = 250 $.

Find $ S_{ 11 } $ ( sum of first $ 11 $ terms ) of arithmetic progression if $ a_1 = 28 ~~ \text{and} ~~ d = 6 $.

Find $ a_{ 85 } $ of an arithmetic progression if $ a_1 = -25 ~~ \text{and} ~~ d = 12 $.

Find $ S_{ 6 } $ ( sum of first $ 6 $ terms ) of arithmetic progression if $ a_1 = 5 ~~ \text{and} ~~ d = \frac{ 1 }{ 2 } $.

Find $ S_{ 5 } $ ( sum of first $ 5 $ terms ) of arithmetic progression if $ a_1 = -1 ~~ \text{and} ~~ d = -2 $.

Find $ a_{ 43 } $ of an arithmetic progression if $ a_1 = 3 ~~ \text{and} ~~ d = 9 $.

Find $ a_{ 7 } $ of an arithmetic progression if $ a_1 = 3 ~~ \text{and} ~~ d = 2 $.

Find $ a_{ 10 } $ of an arithmetic progression if $ a_1 = -17 ~~ \text{and} ~~ d = 4 $.

Find $ a_{ 4 } $ of an arithmetic progression if $ a_1 = -12 ~~ \text{and} ~~ d = \left( -2 \right) $.

Find $ a_{ 4 } $ of an arithmetic progression if $ a_1 = -33 ~~ \text{and} ~~ d = \left( -20 \right) $.

Find $ a_{ 4 } $ of an arithmetic progression if $ a_1 = 7 ~~ \text{and} ~~ d = 20 $.

Find $ a_{ 15 } $ of an arithmetic progression if $ a_1 = 10 ~~ \text{and} ~~ d = 3 $.

Find $ a_{ 78 } $ of an arithmetic progression if $ a_1 = -4 ~~ \text{and} ~~ d = 2 $.

Find $ a_{ 51 } $ of an arithmetic progression if $ a_1 = -17 ~~ \text{and} ~~ d = \left( -8 \right) $.

Find $ a_{ 25 } $ of an arithmetic progression if $ a_1 = 1 ~~ \text{and} ~~ d = \frac{ 2 }{ 3 } $.

Find $ a_{ 92 } $ of an arithmetic progression if $ a_1 = 11 ~~ \text{and} ~~ d = 8 $.

Find $ a_{ 100 } $ of an arithmetic progression if $ a_1 = 1 ~~ \text{and} ~~ d = \frac{ 1 }{ 2 } $.

Find $ a_{ 1000 } $ of an arithmetic progression if $ a_1 = 1 ~~ \text{and} ~~ d = 1 $.

Find $ a_{ 20 } $ of an arithmetic progression if $ a_1 = 2 ~~ \text{and} ~~ d = 2 $.

Find $ S_{ 18 } $ ( sum of first $ 18 $ terms ) of arithmetic progression if $ a_1 = 21 ~~ \text{and} ~~ d = 3 $.

Find $ S_{ 60 } $ ( sum of first $ 60 $ terms ) of arithmetic progression if $ a_1 = 100 ~~ \text{and} ~~ d = 100 $.

Find $ a_{ 0 } $ of an arithmetic progression if $ a_1 = 4 ~~ \text{and} ~~ d = 3 $.

Find $ a_{ 10 } $ of an arithmetic progression if $ a_1 = 19 ~~ \text{and} ~~ d = \left( -6 \right) $.

Find $ S_{ 20 } $ ( sum of first $ 20 $ terms ) of arithmetic progression if $ a_1 = 15 ~~ \text{and} ~~ d = 4 $.

Find $ a_{ 12 } $ of an arithmetic progression if $ a_1 = 5 ~~ \text{and} ~~ d = 4 $.

Find $ S_{ 12 } $ ( sum of first $ 12 $ terms ) of arithmetic progression if $ a_1 = 5 ~~ \text{and} ~~ d = 4 $.

Find $ a_{ 19 } $ of an arithmetic progression if $ a_1 = 4 ~~ \text{and} ~~ d = 9 $.

Find $ S_{ 7 } $ ( sum of first $ 7 $ terms ) of arithmetic progression if $ a_1 = 900 ~~ \text{and} ~~ d = -50 $.

Find $ S_{ 24 } $ ( sum of first $ 24 $ terms ) of arithmetic progression if $ a_1 = 2 ~~ \text{and} ~~ d = 2 $.

Find $ a_{ 35 } $ of an arithmetic progression if $ a_1 = 1 ~~ \text{and} ~~ d = 2 $.

Find $ a_{ 7 } $ of an arithmetic progression if $ a_1 = 3 ~~ \text{and} ~~ d = 3 $.

Find $ a_{ 8 } $ of an arithmetic progression if $ a_1 = 10 ~~ \text{and} ~~ d = 2 $.

Find $ a_{ 19 } $ of an arithmetic progression if $ a_1 = 1 ~~ \text{and} ~~ d = 16 $.