If an AP has common difference 3, find a30-a18?
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a30-a18
a + (30-1)d - a - (18-1)d
29d-17d
(29-17) ×3
12×3=36 Ans
a + (30-1)d - a - (18-1)d
29d-17d
(29-17) ×3
12×3=36 Ans
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