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In a group of `1000` people, there are `750` people, who can speak Hindi and `400` people, who can speak Bengali. `(i)` Find number of people who can

Monjur Alahi

In a group of `1000` people, there are `750` people, who can speak Hindi and `400` people, who can speak Bengali.
`(i)` Find number of people who can speak Hindi only.
`(ii)` Number of people who can speak Bengali only is
`(iii)` Number of people who can speak both Hindi and Bengali is


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Salim Ahmed Kawsar

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Correct Answer - `(i)600 (ii) 250 (iii) 150 `

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निम्न में से प्रत्येक को दशमलव रूप में लिखिए : `{:((a)20+4/10+1/1000,(b)137+5/100),((c)7/10+6/100+4/1000,(d)23+2/10+6/1000),((e)700+20+5+4/100,):}`

Correct Answer - `{:((a)29.41,(b)137.05,(c)0.764,(d)23.206,(e)725.09):}`

2 Answers 1 views
Parameters of blue and red light are 400 nm and 750 nm respectively. Which of the two is of higher energy?

400 nm and 750 nm are the wavelengths of blue and red light respectively. Energy of radiation is given by the expression E = hν and the frequency (ν), of...

2 Answers 2 views
Visible light has wavelengths ranging from 400 nm (violet) to 750 nm (red). Express these wavelengths in terms of frequency (Hz).

Given :  Wavelengths :  λ1 = 400 nm (for violet light),  λ2 = 750 nm (for red light)  To find :  Frequencies : ν1, ν2 Formula :  ν = \(\frac{c}{\lambda}\)  Calculation :  i. Wavelength of violet light,  λ1 = 400 nm =...

2 Answers 1 views
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