If common difference of an ap is 5 then find a 18 - 813
jaslynshawn:
is it a 18 - a 13?
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if we have to find a18 - 813 then answer is a - 728.
d=5
a₁₈= a + 17d
= a + 17(5)
= a + 85
a₁₈ - 813 = a + 85 - 813 = a - 728
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