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On a calendar, three dates lie one below the other in a column. If the top date is a, which expression gives their sum?

Class 7Formulas and Rules from PatternsAlgebra
  • A
  • B
  • C
  • Da + 21

Step-by-Step Solution

Going down one row adds 7 days: a, . Sum = adds 1 instead of 7.)
Answer: A)

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