CUET Mathematics 2025 15 May Shift 1 PYQs

Which of the following are correct?

(A) If a ≡ b(mod n), then -a ≡ -b (mod n)

(B) If a + b = c, then a(mod n) + b(mod n) ≡ (a + b + c)(mod n).

(C) If a ≡ b (mod n), then ka ≡ kb(mod n), ∀ k ∈ I.

(D) If a ≡ b (mod n), then (a + k) ≡ (b + k)(mod n), ∀ k ∈ I.

Choose the correct answer from the options given below:

Consider the function $f: \mathbb{R} o \mathbb{R}$ defined by $f(x) = \frac{x}{x^2+1}$ then

Let $R = \{(L_1, L_2): L_1 \perp L_2\}$ where $L_1, L_2 \in L$ (set of straight line in a plane), then