Question

11) Which term of the A.P 25, 20,15............ is the first negative term. Also find the 5th
term of the A.P​

Answer 1

Answer:

7th term is the first negative term

a5=5

Step-by-step explanation:

First find which term will be zero

$a1+(n-1)d=0\\25+(n-1)(-5)=0\\5(n-1)=25\\n-1=5\\n=6$

This means the next term will be the first negative term i.e., the 7th term.

$a5=a1+(5-1)d\\a5=25+4(-5)\\a5=25-20\\a5=5$

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