Question
100 180 294 448 648
?Solution
53 – 52 = 100 63 – 62 = 180 73 – 72 = 294 83 – 82 = 448 93 – 92 = 648 103 – 102 = 900 Alternate method: 52 × 4 = 100 62 × 5 = 180 72 × 6 = 294 82 × 7 = 448 92 × 8 = 648 102 × 9 = 900
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12@5@7@2@...
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135 × ...
Which of the following interchange of sign would make the given equation correct?
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