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## Answers

so the first term (a) = 168

so using formula for n th term we have

let n be the number if terms

so since the term is negative so

putting the values

⇒ 168 + (n - 1)(-5) < 0

⇒ 168 - 5n + 5 < 0

⇒ 5n > 173

⇒ n > 34.6

so since n can't be fraction so the first negative term is 35

__ANSWER__First term(a) = 168

Common difference(d) = 163 - 168 = - 5

Now An = a + (n - 1 ) d

Since the term is negative so

168 + (n - 1)(-5) < 0

168 - 5n + 5 < 0

5n > 173

n > 34.6

So the first negative term will be 35th term.