There are 4 positions in the string that each have 25 choices (any letter in the English alphabet except A) and the other positions are filled with A, so there are 25⁴ possible strings containing exactly 7 A's.
Overall, there are 26¹¹ possible strings of length 11.
Then the probability of randomly generating a string containing exactly 7 A's is
25⁴ / 26¹¹ ≈ 0.000000000106427
Answer:
x = -18
Step-by-step explanation:
1/2x = -9
(21)1/2x = -9(2/1)
x = -9/1(2/1)
x = -18/1
x = -18
Answer:
Who was the first president of United States?
A Benjamin Franklin
B George Washington
C Abraham Lincoln
D John Adams
I think the answer is 25 miles.
6+4+.7x= 27.50
10+.70x= 27.50
.70x= 17.50
Divide both sides by .7 and the answer is 25.