Question 169722
a)50C7=50!/((50-7)!*7!)=99,884,400
.
b)25C5 * 25C2 =53130 * 300 = 15,939,000
.
c)99,884,400-(25C7*25C0)
=99884400-480700
=99,403,700
.
d)50C7-2(25C7)-2(25C6*25C1)-(25C5*25C2)
=99884400-961400-8855000-15939000
=74,129,000
.
Ed