1) Alok and Bhanu play the following min-max game. Given the
expression,

N = 12 + X*(Y - Z)

where X, Y and Z are variables representing single digits (0 to 9),
Alok would like to
maximize N while Bhanu would like to minimize it. Towards this end,
Alok chooses
a single digit number and Bhanu substitutes this for a variable of her
choice (X, Y or
Z). Alok then chooses the next value and Bhanu, the variable to
substitute the value.
Finally Alok proposes the value for the remaining variable. Assuming
both play to their
optimal strategies, the value of N at the end of the game would be

a)12
b)30
c)93
d)-69

2) same question  N=X-Y-Z

3)same question N=N = 38 + X*(Y – Z)

plz provide me clear explination

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