find an AP whose fourth termnis 9 and the sum of its sixth term and thirteenthterm is40
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eq1) a+3d=9
eq2)2a+17d=40
multiply eq1) by 2 and then subtract it with equation 1
thank me later
eq2)2a+17d=40
multiply eq1) by 2 and then subtract it with equation 1
thank me later
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