please explain the double answer in this question...
find the number of terms in the series 20 + 191 /3 + 182/3 +.......... of which the sum is 300, eplain the double answer.
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https://www.meritnation.com/ask-answer/question/are-needed-to-give-the-sum-25-explain-the-double-ans/arithmetic-progressions/3180670