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B. Solve the following problems with CLEARand COMPLETE solutions.
1.Find the sum of the first 25 odd numbers.
2. Solve for x: +2+2+6+10+-+x=70
3. An arithmetic sequence consists of 21 terms: the sum of the three terms in the middle is 129, and the sum of the last three terms is 237, Find S21.

sana po may solution need po kasi ng teacher namin​