In an ap 5 times the 5th term is equals to 8 x 8 term then it's 13th term is
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Step-by-step explanation:
5 x a5 = 8 x a8
5(a + 4d) = 8(a + 7d)
5a + 20d = 8a + 56d
3a = -36d
a = -12d
a13 = a + 12d = -12d + 12d = 0
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