The book says the answer is (b) but why??
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Considering simplest rational form p/q where p and q are co primes and q≠ 0
0.324 = 324/1000
= 162/500
= 81/250
81 = 3 * 3 * 3 * 3
250 = 2 * 5 * 5 * 5
81 and 250 are co primes
m = 81 and n = 250
m + n = 81 + 250 = 331
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