A carpenter working on a very tall house stood on the middle step of a long ladder. To install a window, he went up 4 steps. To get a tool, he went down 6 steps. Then he went up 7 steps to work on the window again. Then he went up 7 more steps to work on the next level. Finally, he went up the 7 remaining steps to the top of the ladder, and stood on the roof of the house. How many steps does the ladder have?

t = 3

step-by-step explanation:

put t = 3 in this expression :

(3²-1)(3²-2)(3² - 3)(3² - 4) = 8×7×6×5 = 56×30 = 1680

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

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