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The RF amplifier A is having 3 dB NF & 5 dB of gain, amplifier B is having 3.5 dB NF & 15 dB . For overall noise figure of the cascaded system, the correct statement is : 

a. A as first stage & B as second stage offers minimum over all NF b. B as first stage & A as second stage minimum over all NF c. Both the combination will offer same overall NF d. Over all NF will be less than 3 dB.

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