Answer:
= 84
Explanation:
= + ( n - 1 )d
~~~~~~~~~~~~~
= + (5 - 1)d = 24
= + (9 - 1)d = 40
+ 4d = 24 ........... (1)
+ 8d = 40 ........... (2)
(2) - (1)
4d = 16 ⇒ d = 4
+ 8(4) = 40 ⇒ = 8
= 8 + ( 20 - 1 ) × 4 = 84
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