answer me?????plsssss
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singarapusreehanth6:
hi dear
how are you
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as nCr r! = nPr
r! 70 = 1680
r! = 24
r= 4
nPr = 1680
n( n-1)(n-2)(n-3)= 1680
n( n-1)(n-2)(n-3) = 1680= 8(7)(6)(5)
so n= 8
r! 70 = 1680
r! = 24
r= 4
nPr = 1680
n( n-1)(n-2)(n-3)= 1680
n( n-1)(n-2)(n-3) = 1680= 8(7)(6)(5)
so n= 8
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