Question

find the missing term in the
series _,13,_,3​

Answer 1

Step-by-step explanation:

ANSWER

l=a−3d

13=a−d

m=a+d

3=a+3d

a−d=13 -(i) a+3d=3 -(ii)

(i)−(ii)

a−d−a−3d=13−3

−4d=10

d=

2

−5

=−2.5

a=13+d=13−2.5=10.5

l=a−3d=10.5+3(2.5)=10.5+7.5=18

m=a+d=10.5−2.5=8

Answer 2

Step-by-step explanation:

l=a−3d

13=a−d

m=a+d

3=a+3d

a−d=13 -(i) a+3d=3 -(ii)

(i)−(ii)

a−d−a−3d=13−3

−4d=10

d=

2

−5

=−2.5

a=13+d=13−2.5=10.5

l=a−3d=10.5+3(2.5)=10.5+7.5=18

m=a+d=10.5−2.5=8