Book Maths Puzzle Numerical Ability Area and Volume

find the last digit for the below mentioned problems

2^3^4^5
17^27!^37!
(36742)^123!(34767)^28!
562^421+894^642398^983

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Book Other Question

i need help with these problems as well please.

10 divided by w-8 subtracted from 12 over 8-w the answer i got was 22 divided by w-8???? 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