MCQ
$\sum_{r=1}^{10}r \times \ _rP_r$ ની કિંમત ....... છે.
- ✓$ \ _{11}P_{11}-1$
- B$ \ _{11}P_{11}+1$
- C$ \ _{11}P_{11}$
- D$\ _{10}P_{10} \ -1$
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