Let X1, X2,..., X3 denote a random sample from a population having mean u and variance o?. Which of the following is/are unbiased estimator/s of u? X,+X2+.+X, 7 2X1-X6+X4 2 3X,-X3+X4 2 2(X,+X2+..+X,) 04 7

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