15, 13, 11, 9, 7, ...
a = 15
b = 13 - 15 = -2
Un = a + (n-1)b
= 15 + (n-1)(-2)
= 15 - 2n + 2
= 17 - 2n
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15, 13, 11, 9, 7, ...
a = 15
b = 13 - 15 = -2
Un = a + (n-1)b
= 15 + (n-1)(-2)
= 15 - 2n + 2
= 17 - 2n