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21. The first of an AP is 5. the last te is 45 and the sun is 400. Find the number of terms and the common difference​

Answer»

16Step-by-step EXPLANATION:a=5An=45Sn=400Sn=n/2(a+L). (L=An)400=n/2(45+5)400=n/2*50400=25nn = 16



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