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dani19cano
09.03.2021 •
Mathematics
A cylindrical vase has a diameter of 6 inches. At the bottom of the vase, there are 9 marbles, each of diameter 3 inches. The vase is filled with water up to a height of 12 inches.
Which of the following could be used to calculate the volume of water in the vase?
π(3in)2(12in) − 1.5(four over threeπ(9in)3)
π(12in)2(3in) − 1.5(four over threeπ(9in)3)
π(3in)2(12in) − 9(four over threeπ(1.5in)3)
π(12in)2(3in) − 9(four over threeπ(1.5in)3)
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Ответ:
4
Step-by-step explanation:
To find:
The remainder, when 3^0 + 3^1 + 3^2 + ... +3^2009 is divided by 8
Approach and Working:
Rem (3^0/8) = 1
Rem (3^1/8) = 3
Rem (3^2/8) = 1
Rem (3^3/8) = 3
Rem (3^4/8) = 1
Rem (3^5/8) = 3 and so on…
We can observe that,
For even powers of 3, the remainder is 1
And for odd powers of 3, the remainder is 3.
Therefore, we can rewrite the given series, in terms of its remainders, as
= 1 + 3 + 1 + 3 + 1 + 3 + … + 3 = 1005 pairs of (1 + 3) = 1005 x 4 = 4020
Rem (4020/8) = 4