Which term of the AP 25, 20, 15, ... is the first negative term?A. 10thB. 9thC. 8thD. 7th

In the given AP, the first term = a = 25

Common difference = d = 20 - 25 = - 5

To find: place of first negative term.

So, an < 0

Since, we know that

an = a + (n - 1) × d

25 + (n - 1) × (-5) < 0

25 - 5n + 5 < 0

- 5n + 30 < 0

- 5n < - 30

5n > 30

n > 6

7th term of the AP is the first negative term.

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