exam Maths Puzzle Numerical Ability

find the next two tterms in each sequence

5, 10, 20, 40,,

o,t,t,f,f,s,s,e,,

j,f,m,a,m,,

1,2,6,24,120,,

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exam Other Question

Tom can do a job in 3 hours, Dick in 4 hours, and Harry in 6 hours. If they do it together (and do not delay each other), how long does the job take? rewrite middle term as the sum of two terms and factor completely

1.12w^2+19w+4

2.4z^3-18z^2-10z