12. For an AP, if 18 - 14 = 32, then find the
common difference d.
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Answer:
an = a + (n-1)d
where a is a first term and d is a common difference
a18 - a14 = 32
a + 17d - a - 13d = 32
4d = 32
d = 32/4
d = 8
8 is a common difference
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