The arithmetic mean of numbers a, b, c, d, e is M. What is the value of (a - M) + (b - M) + (c - M) + (d - M) + (e - M) ? - NDA Mathematics 2012 (II)

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The arithmetic mean of numbers a, b, c, d, e is M. What is the value of (a – M) + (b – M) + (c – M) + (d – M) + (e – M) ?