first term and common difference of A.P are 8&5 respectively; find a=13 d=-3.5
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an=a+(n-1) intu d
8=13+(n-1)intu-3.5
8-13=n-1intu -3.5
-5=n-1 intu -3.5
-5=3.5n- 3.5
8=13+(n-1)intu-3.5
8-13=n-1intu -3.5
-5=n-1 intu -3.5
-5=3.5n- 3.5
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