Question

a) What is the common difference of the arithmetic sequance 20, 16, 12,.......?
b) How many positive numbers are there in this sequance?
c) Which is the first negative number in this sequance?
d) In which position did the first negative number occur in this sequance?

Answer 1

Answer:

a) 4.

a2-a1=d

b) 6

c) -4

d) 7

Answer 2

Answer:

a) Here,To find the common difference we have subtract

a2-a1=a3-a2

16-20=12-16

common difference denote as (d).

So,d=-4