if log(2^a * 3^b * 5^c) is the arithmetic mean of lob (2^2 * 3^3 *5), log(2^6 *

if log(2^a * 3^b * 5^c) is the arithmetic mean of lob (2^2 * 3^3 *5), log(2^6 * 3 * 5^7) and log(2 * 3^2 * 5^4), then a equals.

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