Math, asked by 4ggamer456, 3 months ago

if a=13,a13=55, find 'd'

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Answered by 12617

2

Answer:

$an = a + ( n - 1)d \\ 55 = 13 + (13 - 1)d \\ 55 - 13 = 12d \\ 42 = 12d \\ d = \frac{7}{2}$

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