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Which of the following multiple access techniques are used by second generation cellular systems? a) FDMA/FDD and TDMA/FDD b) TDMA/FDD and CDMA/FDD c) FDMA/FDD and CDMA/FDD d) FDMA/FDD only

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Which of the following multiple access techniques are used by second generation  cellular systems?
a) FDMA/FDD and TDMA/FDD
c
c) FDMA/FDD and CDMA/FDD
d) FDMA/FDD only
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b) TDMA/FDD and CDMA/FDD
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