The five bells are played simultaneously

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The five bells are played simultaneously in 2, 5, 6, 8 and 9 seconds. How many times will they be together in one hour?

पांच घंटिया एक साथ क्रमशः 2, 5, 6, 8 अवं 9 सेकंड में बजती है | एक घंटे में वे एक साथ कितनी बार बजेगी?

a) 11

b) 12

c) 10

d) 9

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