On 31 Dec, 2005 it was Saturday.
Number of Odd days for 1 normal year 365/7=1
Number of Odd days for leap year 2
so 2006=1odd day
2007=1odd day
2008leap year 2 odd days
2009=1 odd day
Number of Odd days from the year 2006 to the year 2009 = 1 +1+2+1 =5 On 31st Dec 2009 it was Thursday So, 1st Jan 2010 is Friday

On 31 Dec, 2005 it was Saturday.
Number of Odd days for 1 normal year 365/7=1
Number of Odd days for leap year 2
so 2006=1odd day
2007=1odd day
2008leap year 2 odd days
2009=1 odd day
Number of Odd days from the year 2006 to the year 2009 = 1 +1+2+1 =5 On 31st Dec 2009 it was Thursday So, 1st Jan 2010 is Friday

HANUMANTHa ag says

how it is

HANUMANTHa ag says

please tell me how

Vamsi says

On 31 Dec, 2005 it was Saturday.

Number of Odd days for 1 normal year 365/7=1

Number of Odd days for leap year 2

so 2006=1odd day

2007=1odd day

2008leap year 2 odd days

2009=1 odd day

Number of Odd days from the year 2006 to the year 2009 = 1 +1+2+1 =5 On 31st Dec 2009 it was Thursday So, 1st Jan 2010 is Friday

dolly says

then the correct answer is Friday right. why it is showing Monday as correct answer?

Vamsi says

yes.the answer was friday. the question was updated please check once

rimi says

how do we know the leap year in between