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Abhishek Jain

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· 1 Months ago

send me video solution ....!! (Question:581789.0)

doubt send me video solution

Question:

The day on 18.09.1977 was Sunday. A twins was born on this date. In the next 15 years, there how many birthday would fall on Sunday?

Options:
A)

1

B)

2

C)

5

D)

9

Solution:

Ans: (b)

1977 is an ordinary year. We know that the calendar of an ordinary year repeats after 6 yrs or 11 yrs.

Year

Number of odd days 

1978

1

1979

1

1980

2

1981

1

1982

1

1983

1

1984

2

1985

1

1986

1

1987

1

1988

2

Therefore,

Number of odd days from 18.09.1977 to 18.09.1983=7, i.e., 0 odd day

It means that in 1983, 18th September would fall on Sunday.

and number of odd days from 18.09.1977 to 18.09.1988 = 14, i.e., 0 odd day.

Now, it is clear that 2 birthdayस would fall on Sunday in the next 15 yrs. 

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