7x28=196
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The largest Mersenne prime less than 200 is 127.
Multiples of 50 that are less than 200 are 100 and 150.
199
9800 The LCM of 25 & 40 is 200, so need the largest multiple of 200 less than 10000. 10000 ÷ 200 = 50 so 49 x 200 = 9800 is the largest 4 digit number divisible by both 25 and 40.
9 is.