(ii) a, a +d, a + 2d, a + 3d,
find a30- a20
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4
a+29d -(a+19d)
a+29d-a-19d
10d
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a+29d-a-19d
10d
answer
Answered by
14
a30 - a20
a + 29d - (a + 19d)
a + 29d - a - 19d
29d - 19d
10d
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