1.The total number of injections (one-one into mappings) from {a1,a2,a3,a4}\{a_1, a_2, a_3, a_4\}{a1,a2,a3,a4} to {b1,b2,b3,b4,b5,b6,b7}\{b_1, b_2, b_3, b_4, b_5, b_6, b_7\}{b1,b2,b3,b4,b5,b6,b7} isa.400400400b.420420420c.800800800d.840840840Login to continueOnly logged in users canattempt or see the solution.
