If the mean of n numbers of a series is x̄ and the sum of first (n-1) numbers is λ, then the last…
The sum of all \(n\) numbers is \(n\bar{x}\). Since the sum of the first \((n-1)\) numbers is \(\lambda\), the last number is \(n\bar{x} - \lambda\).
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If the mean of n numbers of a series is x̄ and the sum of first (n-1) numbers is λ, then the last number of the series is-
Answer and explanation
Correct answer B
The sum of all numbers is . Since the sum of the first numbers is , the last number is .
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Rajasthan Headmaster Praveshika
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RPSC School Lecturer (School Education)