Question

which term of the AP 20,17,14,.....is the first negative term?
a)8th b)6th c) 9th d) 7th
The first second and last terms of an AP are respectively 4, 7 and 31. How many terms are there in the given AP? a) 10 b) 12 c) 8 d) 13​

Answer 1

Answer:

a) 8th term and b)12..........

Answer 2

Step-by-step explanation:

let an term is 0

a+(n-1)d=an

20+(n-1)(-3)=0

20-3n+3=0

-3n=-23

n=23/3

1st negative term is 8 th term

a2=a+d

7 =4+d

d=3

an=a+(n-1)d

31=4+n-1*3

31=1+3n

3n=30

n=10

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