Solution:(a) Given the 20^("th ") root of 79792266297612 001 is an inteser.{:[20=4k quad" (say) "],[x^(20)=y]:}The last disit is 1 , it meaus last disit of xx can be 1,3,7,9In y, total disits are 17.{:[20 log x=log y],[log x=(log y)//20],[~~(17+(log 8))//20],[~~0 ... See the full answer