book Maths Puzzle Numerical Ability

i thought it was 4/14 but i was wrong...Which of the following is not a fractional representation for 2/7..




6/21

4/14


8/18


4/21

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book Other Question
find the last digit for the below mentioned problems

2^3^4^5
17^27!^37!
(36742)^123!*(34767)^28!
562^421+894^642*398^983
 2x^2 + x -10/-12 + 8x – x^2



2x^2 + 3x -9/ divide x^2 + 10x +24/
2x^2 – 13x + 15 x^2 + x – 30



8x/4-x - 5x/x-4



Divide

4i/6 + 5i


2y√[27