1. Find the 25th triangular number (use a rule). Use Excel to
produce the first 25 triangular numbers. Copy the table(Take
screenshots) into the report and show the formula you typed into
Excel.
2. In the Look, and Say sequence, write the numbers that come
before and after 31131211131221.
1. Find the 25th triangular number (use a rule). Use Excel to produce the first 25 triangular numbers. Copy the table(Ta
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