deboahsouthall
25.05.2021 •
Mathematics
Please help I need it in 5 minutes
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Ответ:
Ответ:
Every row has 4 chairs more than the row in front.
Rn = R(n - 1) + 4
When Rn is the no. of row
Rn = 16 + (n - 1)(4)
Rn = 12 + 4n
n = 8
R8 = 12 + 4(8) = 44 seats
Summation(12 + 4n),
Where n is from 1 till 12
= summation(12) + 4×summation(n)
= 12N + 4 × (N)(N+1)/2
= 12N + 2N(N+1)
N = 12
12(12) + 2(12)(13)
456 seats