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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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