exam Maths Puzzle Numerical Ability

show n!+1 and (n+1)!+1 is relatively prime. Hint: multiply n!+1 by (n+1). Thanks

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Please help me solve this equation

((2x-a)/(x+a))-((x+3a)/(a-x))=(a^2/(a^2-x^2))+3

possible answers:
x=-8a
x=-4a
x=4a
x=8a Use this table to answer my questions:
Population of Europe by age groups (in thousands) in 1950, 1970, and 1995 was:
Age 0-14: 143,175;166,367;139,464
Age 16-64: 359,162; 421,4