The missing terms in AP: - 13 .....3 are
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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
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