WHICH OF THE FOLLOWING BOOLEAN EXPRESSIONS IS NOT LOGICALLY EQUIVALENT TO THE OTHER THREE

NIELIT O Level Exam

Which of the following Boolean expressions is not logically equivalent to the other three?

निम्नलिखित में से कौन सा बुलियन एक्सप्रेशन लॉज़िकली रूप से अन्य तीन के बराबर नहीं है?

A. not(-6<0 or-6>10)

B. -6>=0 and -6<=10

C. not(-6<10 or-6==10)

D. not(-6>10 or-6==10)

Correct Answer is :

D. not(-6>10 or-6==10)

Explanation

The expression not(-6<0 or -6>10) returns the output False. The expression -6>=0 and -6<=10 returns the output False. The expression not(-6<10 or -6==10) returns the output False. The expression not(-6>10 or -6==10) returns the output True.