Answer :

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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