Mathematics, 03.10.2021 17:30 mamshie
The sum of two numbers is 20 and their difference is 12.
Answers: 3
![\displaystyle \large{S_n = \frac{1}{2} n[2a_1 + (n - 1)d]}](/tpl/images/2489/0524/56778.png)
![\displaystyle \large{S_2 = \frac{1}{2} (2)[2a_1 + (2- 1)d]} \\ \displaystyle \large{S_2 = 2a_1 +d}](/tpl/images/2489/0524/7b0a4.png)
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