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angelZ3947
01.12.2021 •
Mathematics
How to solve absolute value inequalities.
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Ответ:
answer: 78125
step-by-step explanation:
since, the total number of seats = 25
and, there are 5 rows of 5 seats.
number of students in first grade = 15
number of students in second grade = 5
also, all the first-grade students occupy the first 3 rows,
thus, in first row total number of possible arrangement = 15
in second row total number of possible arrangement = 15
in third row total number of possible arrangement = 15
in fourth row total number of possible arrangement = 5 ( because all the first grade students got their seats )
in fifth row total number of possible arrangement = 5
thus, the total number of possible arrangement of sitting in 25 seats = 15 × 15 × 15 × 5 × 5 = 3125 × 25 = 78125