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If 1/2,1/alpha1 , 1/alpha2 , ….., 1/alph...

If `1/2,1/alpha_1 , 1/alpha_2` , ….., `1/alpha_20 , 1/6` are in A.P. and `1,beta_1,beta_2` ….., `beta_20` , 6 are in AP. Then, the number of digits in value of `alpha_18beta_3` is ____

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