defence exam ITBP (Telecommunication) Head Constable Mock Test 2024 Mathematics Permutations and Combinations

If 8. \(^{7}p_r\) = 7 . \(^8P_{r-1}\) , what is the value of 'r' ?

1
3 & 4
2
2 & 5
3
4 & 5
4
No solution (No such 'r' exists)
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