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posted by Meenakshi Tuesday, December 4, 2012 at 5:33am.

Find a30 -a20 for the AP a, a+d, a+2d, a+3d........

an=a+(n-1)d so a30=a+(30-1)d=a+29d Similarly a20=a+19d so their difference is; a+29d-(a+19d)=a+29d-a-19d=10d

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