Question

How many leap years are there in set of any consecutive $400$ years?

Answer 1

97 years out of every 400 are leap years,

In 100 years there are 24 leap years and 76 normal years.

400 years $=4\times 24=96$

400 year has 96 leap year + 1 year (i.e, 400 is leap year)

So, 29th February will come 97 times in 400 years.