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The pattern followed here is: 3 is added to the 1st number and then the number is divided by 2 to obtain the 2nd number. In option a, 513: 258 [(513 + 3) ÷ 2] = [516 ÷ 2] = 258 In option b, 321: 162 [(321+ 3) ÷ 2] = [324 ÷ 2] = 162 In option c, 485: 244 [(485 + 3) ÷ 2] = [488 ÷ 2] = 244 In option d, 363: 118 [(363 + 3) ÷ 2] = [366 ÷ 2] = 183
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