(i)The bulb X lasts longer than bulb Y (ii)The bulb Y does not lasts longer than bulb Z.(iii) Bulb Z lasts longer than bulb X .If the statements (i)and(ii) are true hen the statement (iii) is :

Explanation
Let's analyze the statements to determine the validity of statement (iii). Statement (i): The bulb X lasts longer than bulb Y. X > Y Statement (ii): The bulb Y does not last longer than bulb Z. Y ≤ Z Statement (iii): Bulb Z lasts longer than bulb X. Z > X Combining the information from statements (i) and (ii): From (i): X > Y From (ii): Y ≤ Z To find if (iii) is true, we need to see if Z > X can be logically derived from the given statements: Since X > Y and Y ≤ Z, we can deduce X > Y ≤ Z, which means X is greater than or equal to Z ( X > Z is not necessarily true, but X > Y ≤ Z suggests X may or may not be greater than Z ). Therefore, without additional information, we cannot definitively conclude whether Z > X is based solely on statements (i) and (ii). So, the answer is " Uncertain ."