2 years ago

1/3 + 1/4 help please

Mathematics

1 answer:

Cloud [144]2 years ago

6 0

Answer:

2/7

Step-by-step explanation:

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Lynna [10]

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10(3.6) = 36

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Hope this helps!

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3 years ago

Help 6,000 ÷ 20 - 34 × 8 + 12 ×9

Strike441 [17]

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3 years ago

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mihalych1998 [28]

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3 years ago

Identity true statements about quadratic function y = ax^{2} +bx+c, where a =/= 0.

vesna_86 [32]

The true statements are (1) and (2)

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3 years ago

(b) If a series follows geometric progression, show that the ratio of the sum of term to the sum from (n+1) term to (2n) term is

Nadusha1986 [10]

Proof with explanation:

We know that the sum of first 'n' terms of a Geometric progression is given by

$S_{n}=\frac{a(1-r^{n})}{1-r}$

where

a = first term of G.P

r is the common ratio

'n' is the number of terms

Thus the sum of 'n' terms is

$S_{n}=\frac{a(1-r^{n})}{1-r}$

Now the sum of first '2n' terms is

$S_{2n}=\frac{a(1-r^{2n})}{1-r}$

Now the sum of terms from $(n+1)^{th}$ to $(2n)^{th}$ term is $S_{2n}-S_{n}$

Thus the ratio becomes

$\frac{S_{n}}{S_{2n}-S_{n}}\\\\=\frac{\frac{a(1-r^{n})}{1-r}}{\frac{a(1-r^{2n})}{1-r}-\frac{a(1-r^{n})}{1-r}}\\\\=\frac{1-r^{n}}{r^{n}-r^{2n}}\\\\=\frac{1-r^{n}}{r^{n}(1-r^{n})}\\\\=\frac{1}{r^{n}}$

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3 years ago