No, the combination lock is not appropriate. This is so as the repetition is allowed, neither permutation nor the combination rule holds true or valid.
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<span>1) A
2) B
3) D
I'm not sure though
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Number of different selection = 50C6
Number of different selection = 50 x 49 x 48 x 47 x 46 x 45
Number of different selection = 15 890 700
Answer: 15 890 700
36259 + 12258 + 1988 = 50,505 per year
I do not know if ur question is asking how much she will pay for 1 yr, or for 4 years. But if it is for 4 yrs, it will be 4(50,505) = 202,020.