Question 14 (2 points) Saved How many solutions are there of the equation x1 x2 x3 + x4 = 19 where X1, X2, X3 and X4 are non-negative integers. 19 Only enter the digits of your answer, no spaces or commas. How many of these solution have x2 = 1 ? 190 A Recurrence Relation Question 15 (2 points) Saved The general solution of the recurrence relation an-an-1+12an-2 is anc14"+C2(-3)" = If a0-5 and a1=6, then the value of c is 3 A and the value of c is 2