book Maths Puzzle Numerical Ability

Six strangers arrive at a business seminar and each person shakes hands with every other person. How many handshakes are there?

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book Other Question

What will the Earth�s population be in 2025?

P( in billons) = 4 x 2^(y-1975)/35
The U.S. population in 1990 was approximately 250 million, and the average growth rate for the p Find the projection on the x-axis if AB = 10 and theta = 30 degrees.