উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।
ব্যাখ্যা ও সঠিক সমাধান
উত্তর:
i, ii ও iii
f(x) = (x-3)/(x-5). (i) f(a)=f(b) => a=b, so one-to-one. (ii) Range is R-{1}, so it is onto. (iii) f(-5) = (-5-3)/(-5-5) = -8/-10 = 0.8. Wait, the question says f(-5) is undefined. Let's check: f(5) is undefined. The option says f(-5) is undefined, which is false. Let's re-read. The image says (i) and (ii) are correct. Let's re-check (iii). f(-5) = -8/-10 = 0.8. So (iii) is incorrect. The correct answer is i ও ii.