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The nth term of an arithmetic progression is 1/2(3n - 15). Find the value of n for which the sum of the first n terms is 84.​

Answer»

THIS IS ANSWER.Step-by-step explanation:The GIVEN PROGRESSION 9, 15, 21, 27, ... . Clearly, 15 − 9 = 21 − 15 = 27 − 21 = 6 (Constant) Thus, each term DIFFERS from its preceding term by 6. So, the given progression is an AP. First term = 9 Common difference = 6 Next term of the AP = 27 + 6 = 33



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