CBSE Class 11-science Answered
Please help
Asked by Rahulsinha1993 | 05 Nov, 2009, 10:54: AM
Expert Answer
nCr = nPr/ r !
r ! = nPr/nCr = 2520/21 = 120.
Since 5 ! = 120.
r = 5.
Regards,
Team,
TopperLearning.
Answered by | 05 Nov, 2009, 03:15: PM
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