You cannot.
The average is the mean of a number of observation, and each individual observation cannot be uncovered. We therefore also often study "Variation" or "Standard Deviation" being the sum of square of each observation and the average. You get the Standard deviation by tracting the square root of the variance. Thsi indicates the "spread" of the values.
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no,factorization is the reverse process of multiplication
The reverse, in the sense of undoing the effects of "divide by 21" is "multiply by 21".
pervv
because before calculater we used abacus.In abacus we learnt in reverse order
Division