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In a group of 800 people, 550 can speak Hindi and 450 can speak English. How many can speak both Hindi and English?

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In a group of 800 people, 550 can speak Hindi and 450 can speak English. How many can speak both Hindi and English?
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People who can speak Hindi `,n(A) = 550`
People who can speak English`,n(B) = 450`
Total number of person in the group `n(AuuB) = 800`
`:.` People who can speak both hindi and english,
`n(AnnB) = n(A)+n(B) - n(AuuB) = 550+450-800 = 200.`
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