हल करना s dot n = n 2 [2a+(n-1)d] | Equatix - Math Solver

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Example

3(r+2s)=2t-4

a⋅(b-2)=3b

3(r+2s)=2t-4

a⋅(b-2)=3b

Question

$$s\dot{n}=\frac{n}{2}[2a+(n-1)d]$$