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November 28, 2014

November 28, 2014

Posted by **Meenakshi** on Tuesday, December 4, 2012 at 5:33am.

- maths -
**kay**, Tuesday, December 4, 2012 at 7:40aman=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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