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That still doesn't explain what you want. Do you want to connect two 4017 counters in series to count 20?
Ken
I think the OP wants to cascade them so that each of the 20 outputs go high in sequence which (to my knowledge) isn't possible. Cascading so that the outputs count 00 to 99 can be done.
Mike.
It will not work.take "carry out" pin on first , and put it to clock on second