. There are seven stations between Chennai and Howrah. How many type of second class tickets should be printed so as to serve all type of passengers?
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from 1st station 8
from 2nd station 7
from 3rd station 6
from 4th station 5
from 5th station 4
from 4th station 3
from 3rd station 2
from 2nd station 1
then add total:8+7+6+5+4+3+2+1=36
from 2nd station 7
from 3rd station 6
from 4th station 5
from 5th station 4
from 4th station 3
from 3rd station 2
from 2nd station 1
then add total:8+7+6+5+4+3+2+1=36
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