The number of odd proper divisors of \( 3^{\mathrm{p}} \cdot 6^{\mathrm{m}} \cdot 21^{\mathrm{n}...
The number of odd proper divisors of \( 3^{\mathrm{p}} \cdot 6^{\mathrm{m}} \cdot 21^{\mathrm{n}} \) is
(a) \( (p+1)(m+1)(n+1)-2 \)
(b) \( (p+m+n+1)(n+1)-1 \)
(c) \( (p+1)(m+1)(n+1)-1 \)
(d) \( (p+1)(m+1)(n+1) \)
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