Well I think the answer is C.
Stmt 1 : t1+t1+...+tn = 3124.
From this we can't get the value of n.
Stmt 2 : (t1+t1+...+tn)/n = 4.
From this also we can't get the value of n.
But if we combine the two we get n = 3124/ 4.
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