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e-lub [12.9K]
3 years ago
6

Branliest to correct answer explain how to solve it please

Mathematics
1 answer:
Marysya12 [62]3 years ago
6 0

In general, nCr = n! / r! (n-r)!

Here, 7C3 = 7! / 3!(7-3)!

=7 x 6 x 5 x 4 x 3 x 2 x 1 /3 x 2 x 1 ( 4 x 3 x 2 x 1)

=7x6x5x4 / 4x3x2

=7x5x6x4 / 24

=35x24 / 24

=35

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Find two positive numbers whose difference is 7 and whose product is 2438.
GaryK [48]

Answer: 348  and 355

Step-by-step explanation:

Let  two positive numbers are  x and y

so,

when  the difference is 7 then equation will become

x-y=7                   Eq(1)

when product is 2439 then equation will become

x*y=2438             Eq (2)

By rearranging Equation (2)

x= 2438/y         Eq(3)  

Now put the value of x as in eq (3) in eq(1) to get y's value

(2438/y)-y=7

(2438-1)/y =7

2437 / y =7

2437/7 =y

y=348.14    approx  348

Put the value of y in Eq(1) for x

x-348=7

x=7+348

x=355

so the two positve numbers are  355 and 348

For Check

x-y=7

355-348=7

7=7

5 0
3 years ago
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