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If the sum of the series 54 + 51 + 48 + ... is 513, then the number of terms are

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If the sum of the series 54 + 51 + 48 + ... is 513, then the number of terms are

(A)  18

(B)  20 

(C)  17 

(D)  None of these

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Correct option  (A)  18

According to condition

Hence, n =18. 

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