# MadeEasy Full Length Test 2018: Digital Logic - Multiplexer

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If A and B are connected to the select lines of the MUX circuit, then the min-terms of the boolean function recognized by the circuit are _____ ? edited
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A' B' D + A' B ( C + D )' + A B' C D + AB

= A' B' D + A' B C' D' + AB' CD + AB

MINTERMS = { 1,3,4,11,12,13,14,15 }
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They are evaluating function f as: The order of select lines is confusing me. Should it not be S0S1 instead of S1S0 (as mentioned in the solution).

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sorry, i didn't seen the select lines, due to generally they assign A to S1 and B to S0.

but in this question, they assigned in the reverse manner.

The order of select lines is confusing me. Should it not be S0S1 instead of S1S0 (as mentioned in the solution).

it is always like MSB is S1, and LSB is S0

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it is always like MSB is S1, and LSB is S0

Could you provide any reference for the same.

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So the answer given by Shaik Masthan is correct, isn't it?

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nooo... I treated S1= A and S0 = B

but in the question, S1= B and S0 = A
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kapilbk1996 The evaluating function which u gave seems incorrect.

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kapilbk1996 Moreover the answer which u gave is actually the max terms and not the minterms.

According to me, f = {1,3,7,8,12,13,14,15} would be the answer.

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I am getting the answer in minterms as f={1,3,7,8,12,13,14,15}.

Correct me if I am wrong!
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the required function is

if F(A,B,C,D) = ∑m(1,3,7,8,12,13,14,15)

if F(B,A,C,D) = ∑m(1,3,4,11,12,13,14,15)

it is responsibility of the questioner which function is he/she required !

I0-- 1,3

I1-- 6,5

I2-- 11

i3-- 12,13,14,15
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Abhishek Kumar Sinha I1 should be 4, rest all right  if i wrong then correct me ?

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