On 25th January, 1966, Tuesday falls. What day of the week was it on 25th January, 1965?

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Monday. The known date is 25th January, 1966, a Tuesday. We need the same calendar date exactly one year earlier, in 1965. A gap of exactly one year is normally 1 odd day, but it is 2 odd days if a 29 February falls inside that gap. The year to check for that 29 February here is 1965. 1965 is not a leap year, so no 29 February falls inside the gap. So the shift between the two dates is 1 odd day(s). Going back 1 day(s) from Tuesday gives Monday. Check: 25th January, 1965 is indeed a Monday.

On 25th January, 1966, Tuesday falls. What day of the week was it on 25th January, 1965?

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