Find a₃₀-a₂₀ for the A.P.
(i)-9,-14,-19,-24,...
(ii)a,a+d,a+2d,a+3d,...
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(i) a30 - a20 = 50
(ii) a30 - a20 = 10d
Step-by-step explanation:
(i) -9,-14,-19,-24,...
a = -9
d = -5
an = a + (n-1)d
a30 - a20 = -9 -29(5) +9 +19(5)
= 5(19-29)
= 5 (10)
= 50
a30 - a20 = 50
(ii) a, a+d, a+2d, a+3d....
an = a + (n-1)d
a30 - a20 = a + 29d - (a +19d)
a30 - a20 = 10d
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