Q53. What is the total number of injective functions (one-to-one mappings) from the set {a1, a2, a3, a4} to the set {b1, b2, b3, b4, b5, b6, b7}?Mathematics — NUST Mock By IBAGRADS 4 — Question 53 of 200A. 400B. 420C. 800D. 840Practice more Mathematics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →