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A pendulum strikes 5 times in 3 secon...

A pendulum strikes 5 times in 3 seconds and another pendulum strikes 7 times in 4 seconds. If both pendulum start striking at the same time, how many clear strikes can be listened in 1 minute? (a) 195        (b) 199     (c) 200      (d) 205

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A pendulum strikes 5 xx in 3 seconds and another pendulum strikes 7 xx in 4 seconds.If both pendulum start striking at the same time,how many clear strikes can be listened in 1 minute? (a) 195quad (b) 199 (c) 200 (d) 205

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