if the common difference of an AP is -4 then What is 13th term -18th tern
-4
4
20
-20
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Answered by
0
Answer:
20
Step-by-step explanation:
if the common difference of an AP is -4 then What is 13th term -18th tern
-4
4
20
-20
Answered by
0
Answer:
a,b, c is in AP then
2b = a+c
2(2k-1) = k+9 +2k+7
4k -2 = 3k +16
k = 18
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