Question

3. Which term of the progression 19, 18, 17,... ... ... is the first negative term
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Answer 1

The progression will be as follows:

19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, -1, -2.....

Clearly -1 is the first negative term

Answer 2

Step-by-step explanation:

If the terms are negative then

a+(n-1)d<0

here

a=19

d=-1

so

19+(n-1)*-1<0

19-n+1<0

20-n<0

20<n

so n=21

21st term is the first negative term