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aleksley [76]
3 years ago
9

Find the fifth term of a geometric sequence for which a3= 20 and r= 2.

Mathematics
1 answer:
Dahasolnce [82]3 years ago
4 0

Answer:

The fith number is 80.

Step-by-step explanation:

A geometric sequence is a group of numbers that are related to it's neighbours by a product of a constant ratio. In order to calculate a certain number in such sequences we can use the formula:

an = a1*q^(n-1)

Where "n" is the position of the number we wish to know and q is the ratio. To use the formula we need to know the first number and we were given the third, so we first need to find that. We have:

a3 = a1*q^(3 - 1)

20 = a1*2^(2)

a1*4 = 20

a1 = 20/4 = 5

So the 5th number is:

a5 = a1*q^(5-1)

a5 = 5*2^(4)

a5 = 5*16 = 80

The fith number is 80.

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Probability:

Probability refer the possible occurrence of any particular event.

Given,

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Here we need to find whether we able to play this one or not.

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To know more about Probability here.

brainly.com/question/11234923

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