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For the general case of n masses coupled by n +1 springs, the mass matrix M...

For the general case of n masses coupled by n +1 springs, the mass matrix M

1) is a (n+1) x (n+1) diagonal matrix (i.e. all off-diagonal elements are identically equal to zero).
2) is a (n+1) x (n+1) non-diagonal matrix (i.e it has non-zero off-diagonal elements).
3) is a (n) x (n) diagonal matrix (i.e. all off-diagonal elements are identically equal to zero).
4) is a (n) x (n) non-diagonal matrix (i.e it has non-zero off-diagonal elements).
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The answer is 3)..

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