¿Progresiones Aritmeticas, Ejercicios Urgente, Por Favor?!?

Dados:

a) S = 1395; d = 11 y n = 15. Calcular a1.

b) S = 988; a1 = 10; n = 13. Calcular d

c) S = 1040; a1 = 20; d = 6. Calcular n.

d) S = 896; n = 14; an – a1 = 104. Calcular a1, an y d.

e) S = 336, a1 = 50; d = -4. Calcular n y an

f) S = 960; a = 120; n = 16. Calcular d y an

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