Linux Bash Arithmetic Expressions Question:

Which one of the following is not a valid operator in bash shell?
a) ||
b) ~
c) =<<
d) -=

c) =<<

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Which one of the following is bit-wise 'exclusive or' operator? a) ^= b) \|= c) != d) none of the mentioned	What is the output of this program? If: 1) #!/bin/bash 2) a=2 3) b=4 4) let c=a**b 5) echo $c 6) exit 0 Options: a) 8 b) 16 c) 32 d) none of the mentioned