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a. Take the 3rd integer as n
so n-2+n-1+n+n+1+n+2 = 755
so 5n = 755
n = 151
so (n-2) (n+2) = 149*153 =22797
b. n-2+n-1+n+n+1+n+2 = 575
n = 575/5 =115 = mean
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