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Which are the essential prime implicants of the following Boolean function?

$f(a, b, c)= a' c+ ac'+b' c$

1. $a' c$ and $ac'$
2. $a' c$ and $b' c$
3. $a' c$ only.
4. $ac'$ and $bc'$
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using K map f = ac' + a'c
selected
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yes you are right, b'c is selective prime implicant.
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what does here " $"( the symbol which is used in question) mean...is it XOR or something else ?? +1 take that symbol as complement symbol. i think this is typing mistake. +2 Just to see it visually ;) Clearly$A\bar{C}$and$\bar{A}C\$ cover cells that are not covered by any others.