Variables X and X, follow generalized Wiener processes, with drift rates, and pand variances of and What

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Variables X and X, follow generalized Wiener processes, with drift rates, and pand variances of and What process does X, +X, follow if

(a) The changes in X, and X, in any shoet interval of time are uncorrelated? (B) There is a correlation between the changes in X, and X, in any short time interval?

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