exam Maths Puzzle Numerical Ability

if A,B and C are angles of a triangle ,prove that cosA+cosB+cosC>1

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exam Other Question

In 1990, 28% of babies in the United States were boren to parents who were not married. Throughout the 1990s, this increased by approx. 0.6% per year. If this trend continues in which year will 37% of babies be born out of wedlock?

thanks. Find the sum of all positive six digit intergers who digits are a permutation of the digits in the # 123,456 ... list them all.