(b) n2 - 3n + 4 is even for all 2. There are 30 pupils in a class.
(a) You make a row of 7 pupils. In how many ways can this be done?
(b) You divide the class into two groups of 15 each. In how many ways
(c) You give each of the 30 pupils one type of cooldrink from 5 different
how many ways can this be done?
(d) Ignoring who gets which cooldrink, how many different cooldrink con
if you choose 30 cooldrinks from 5 types?
{
(3)
Hou mani code words over a hod of length 20 contain exactly 10​

I've been working on this for a few days and i just don't understand, it's due in a few hours. you.the direction of a vector is defined as the angle of the vector in relation to a horizontal line. as a standard, this angle is measured counterclockwise from the positive x-axis. the direction or angle of v in the diagram is α.part a: how can you use trigonometric ratios to calculate the direction α of a general vector v = < x, y> similar to the diagram? part bsuppose that vector v lies in quadrant ii, quadrant iii, or quadrant iv. how can you use trigonometric ratios to calculate the direction (i.e., angle) of the vector in each of these quadrants with respect to the positive x-axis? the angle between the vector and the positive x-axis will be greater than 90 degrees in each case.part cnow try a numerical problem. what is the direction of the vector w = < -1, 6 > ?