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help tracing a vector

Brooklyn (19)
Help tracing a vector 

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Show the values in each vector after the following statements:
int intArr[] = {2, 5, 11, 9, 25};
vector<int> vA(3,1), vB(5), vC(intArr, intArr+4); 

vA.push_back(2);
vB.resize(3);
vC.pop_back();

(a) vA = 
(b) vB = 
(c) vC =
Brooklyn (19)

vA.push_back(2); = [adding 2 to the end that would give us 1 1 1 2

vB.resize(3); = resize the vector to 3 elements so 0 0 0

vC. pop_back(); i don't understand
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