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[" 4.(a) "If^(22)P(r+1):^(20)P(r+2)=11:5...

[" 4.(a) "If^(22)P_(r+1):^(20)P_(r+2)=11:52," find "r],[" (b) "If^(56)P_(r+6):^(54)P_(r+3)=30800:1," find "r]

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If 22P_(r+1):^(20)P_(r+2)=11:52, find r

If 22P_(r+1):^(20)P_(r+2)=11 : 52 ,find r

If ""^(56)P_(r+6) : ""^(54)P_(r+3)= 30800, then r is

If "^56P_(r+6) : "^54P_(r+3) = 30800 : 1, the r =