1.

Find the nth term of the following sequence.1. 5, 2, -1, -4, -7,…2. 12, 7, 2, -3, -8,…….

Answer»

1. a = 5; d = 2 – 5 = -3

tn = a + (n – 1)d = 5 + (n – 1)(-3)

= 5 – 3n + 3 = -3n + 8

2. a = 12; d = 7 – 12 = -5

tn = a + (n – 1)d = 12 + (n – 1)(-5)

= 12 – 5n + 5 = -5n + 17.



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