Q. 64.0( 17 Votes )

Which term of the

Answer :

Given AP is

Whose, first term, a = 20

common difference,

Let nth term of the AP be the first negative term.

Then, we have to find the least value for which

an < 0

And we know, nth term of an AP = a + (n - 1)d

Where a and d are first term and common difference respectively.

a + ( n - 1 )d < 0

-3( n - 1 ) < -80

3(n - 1) > 80

3n - 3 > 80

3n = 83

so, n will be least natural number greater than i.e.

i.e., 28th term is the first negative term of the given AP.

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