The number of solutions of the equation tan(x) + sec(x) = 2cos(x) and cos(x) 0 lying in the interval () is :
2
1
0
3
If birth to a male child and birth to a female child are equal-probable, then what is the probability that at least one of the three children born to a couple is male ?
B.
S = {BBB, BBG, BGB, GBB, GGB, GBG, BGG, GGG}
and E = {BBB, BBG, BGB, GBB, GGB, GBG, BGG)
n(E) = 7 and n(S) = 8