If 25th June 2018 was a Monday, then 6th June 2018, was also a Monday.
FALSE
Given: 25th June 2018 is a Monday.
Subtracting 7 , 25 - 7 = 18
18- 7 = 11
11- 7 = 4
⇒ 18th, 11th and 4th of June, 2018 all fall on Mondays.
⇒ 6th June 2018 cannot be a Monday, as 4th June 2018 is a Monday.
∴ 6th June 2018 is a Wednesday, and hence the statement is False.