exam Maths Puzzle Numerical Ability

what is the nth term of an arithmetic sequence, what is the 101st term
2,4,6,8,10....

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hi could you help me solve this rational equation?

(2x-4)/(x-5)=0

Thanks a lot 1/R= 1/R1 + 1/R2 SOLVE THE EQUATION FOR R1 IN TERMS OF R AND R2.

i KNOW the first step is to isolate 1/r1

1/r-1/r2=1/r1

my guess is r1= (r-r2)/r*r2