Question

Which term of the AP:3, 8, 13, 18,...,is 78?
Find the number of terms in each of the following APs :​

Answer 1

Answer:

sixteenth term

(16)

Step-by-step explanation:

$a{n} = a + (n - 1)d \\ 78 = 3 + (n - 1)5 \\ 78 = 3 + 5n - 5 \\ 5n - 2 = 78 \\ 5n = 78 + 2 \\ 5n = 80 \\ n = \frac{80}{5 } \\ n = 16 \: th \: term$

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