The flexural tensile strength of $\mathrm{M} 25$ grade of concrete, in $\mathrm{N} / \mathrm{mm}^{2},$ as per IS:456-2000 is

The flexural tensile strength of $\mathrm{M} 25$ grade of concrete, in $\mathrm{N} / \mathrm{mm}^{2},$ as per IS:456-2000 is

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