if 9,2x+1,25 are in A. P. Find x.
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Airthemetic progression
Given
9,2x+1,25 are in ap
so there common difference
2x+1-9 = 25-(2x+1)
2x-8 = 25-2x-1
2x+2x=24 +8
4x= 32
x= 8
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