the sum of third and seventh term of an A.P is 6 and their product is 8. find first term and common difference of an A.P?
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a3 + a7 = 6
a+2d +a+6d =6
2a + 8d =6
2( a+4d) =6
a+4d =3
a=3 - 4d ----------------(1)
a3 × a7 =8
a +2d ×a +6d =8
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