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Option 4 : Both I and IV

The pattern follow is:

62 × 51 = 35; it can be obtained by dividing the number except unit digit with the unit digit i.e.,

62 × 51 = 6 ÷ 2 × 5 ÷ 1 = 3 × 5 = 35;

Similarly,

153 × 168 = 52;

153 × 168 = 15 ÷ 3 × 16 ÷ 8 = 5 × 2 = 52;

Similarly,

I) 42 × 182

42 × 182 = 4 ÷ 2 × 18 ÷ 2 = 2 × 9 = 29;

II) 93 × 728

93 × 728 = 9 ÷ 3 × 72 ÷ 8 = 3 × 9 = 39;

III) 364 × 189

364 × 189 = 36 ÷ 4 × 18 ÷ 9 = 9 × 2 = 92;

IV) 126 × 273

126 × 273 = 12 ÷ 6 × 27 ÷ 3 = 2 × 9 = 29;

Hence, 42 × 182 = 29 and 126 × 273 = 29 are the correct answer.
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