Book Maths Puzzle Numerical Ability Sequence and Series

Find number in ten's place of 1!+2!+3!+.........+50!?

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Book Other Question

next door to me live four brothers of different heights.Their average height is 74 inches.Difference in heights amongst first three is 2 inches.Difference between third and fourth men is 6 inches.Can you tell how tall is each brother? A father's age is thirteen times that of his son. In 10 years, the son's age will be one-third of his father's. How old are the father and son?