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Match List-I with List-II

List-IList-II
(A) 5P4−5P2^5P_4 - {^5P_2}(I) 120
(B) 15C11−10C4^{15}C_{11} - {^{10}C_4}(II) 2520
(C) In how many ways, the letters of the word 'STRESS' be arranged?(III) 100
(D) In how many ways, the letters of the word 'BANKING' be arranged?(IV) 1155

Choose the correct answer from the options given below:

Solution

✅ Correct Option: 3

5P4−5P2=120−20=100^5P_4 - {^5P_2} = 120 - 20 = 100, so (A)-(III). 15C11−10C4=1365−210=1155^{15}C_{11} - {^{10}C_4} = 1365 - 210 = 1155, so (B)-(IV). STRESS has 6 letters with S thrice: 6!/3!=1206!/3! = 120, so (C)-(I). BANKING has 7 letters with N twice: 7!/2!=25207!/2! = 2520, so (D)-(II).

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