Question

What does it mean by the first term of each is unity in ARITHMETIC PROGRESSIONS?​

Answer 1

Answer:

The first term of each is unity and the common differences are 1, 2, and 3 respectively. ... Hint: The sum of n terms of an AP is given by the formula S=n2(2a+(n−1)d) where a is the first term and d is the common difference. Use this formula to find S1, S2 and S3 and prove that they satisfy the given condition S1+S3=2S2.