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punit tyagi 7punit tyagi 7 

batchclass9 bt9=new batchclass9(); for(integer i=0;i<=59;i=i+5) { string str='0 '+i+' * 1/1 * ? *'; system.schedule('batchclass9'+i,str,bt9); }

 string str='0 '+i+' * 1/1 * ? *'
how +i+ increment please explain in deep how this increment
AbhishekAbhishek (Salesforce Developers) 
https://salesforce.stackexchange.com/questions/98402/incrementing-a-field-1

I suspect your query is answered here,Check it.