Math, asked by 4ggamer456, 2 months ago

if a=13,a13=55, find 'd'​

Answers

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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