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d since every convergent sequence is cauchy sequence according to defination for €>0 there exist n0 such that |xm-xn|<€
sir it is multiple correct answer.... c and d both is correct... but i don't understand what that all the options meaning... plz sir tell some solution of this definition besed questions
taking Xn=1+1/2+1/3+....+1/n then |Xn+1-xn|=1/n+1 <€ but {Xn} not convergent
|Xn+1-xn|<€(n+1)² for large n it is not possible so B not true
|Xn+1-xn|<€/(n+1)² <€ c true