Question

Whats the formula of finding no of terms in arithmetic sequence, ​

Answer 1

$= > an = a + (n - 1)d \\ = > \frac{an - a}{d} = n - 1 \\ = > 1 + \frac{an - a}{d} = n \\ where \: an = last \: term \\ d = common \: difference \\ a = first \: term \\and n = no. \: of \: terms$

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