Question

Show that the progression 13,8,3,-2,-7 is an A.P. Find its first term and the common difference

Answer 1

Answer:

first term of this A.P is a1=13

common difference of an A.P is given by

(i.e.,d=a

n+1

−a

n

)

putting n=1 in above equation

d=a

2

−a

1

=8−13=−5

hence common difference for this A.P is d=−5