Let (*) be a binary operation, on the set of all non-zero real numbers, given by a*b for all a, b ∊ R – {0}. Write the value of x given by 2 * (x * 5) = 10. [CBSE 2014]

Let * be a binary operation on set of integers I, defined by a*b = 2a + b – 3. Find the value of 3*4.[CBSE 2011]

Let * be a binary operation on N given by a*b = LCM(a, b) for all a, b ∊ N. Find 5*7. [CBSE 2012]

If R = {(x, y): x + 2y = 8} is a relation on N, write the range of R. [CBSE 2014]

If a * b denotes the larger of ‘a’ and ‘b’ and if a∘b = (a*b) + 3, then write the value of (5)∘(10), where * and ∘ are binary operations.[CBSE 2018]