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Q 2452591434.     On a railway route between two places `A` and `B`, there
are `20` stations on the way. If `4` new stations are to be
added, how many types of new tickets will be required
if each ticket is issued for a one way journey?
IAS 2005 Prelims
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)