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Amanda [17]
3 years ago
13

What is the square root of -1 - 6 in the form a + bi?

Mathematics
1 answer:
laila [671]3 years ago
3 0

Answer:

B

Step-by-step explanation:

Since i is equal to the square root of -1, all we have to do is add i to -6 and that will get us to -7

Hope this helps

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a broker gets rs 20000 as commission from sale of a piece of land which costs rs 8000000. Find the rate of commission.​
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0.25%

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3 0
3 years ago
How many passwords of 4 digits are there(a)if none of the digits can be repeated?(b)start with 5 and end in an even digit?
liraira [26]

Answer:

5040,56

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We have to construct pass words of 4 digits

a) None of the digits can be repeated

We have total digits as 0 to 9.

4 digits can be selected form these 10 in 10P4 ways (since order matters in numbers)

No of passwords = 10P4

= 10(9)(8)(7)\\=5040

b) start with 5 and end in even digit

Here we restrain the choices by putting conditions

I digit is compulsorily 5 and hence only one way

Last digit can be any one of 0,2,4,6,8 hence 5 ways

Once first and last selected remaining 2 digits can be selected from remaining 8 digits in 8P2 ways (order counts here)

=56

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