M (a + (j- 1)d) =(2a + (n-1)d) j=1 Sequences. Hint: First write down what P(1) says and then prove it. Then write down what P(k+1) says using the fact that P(k) is true. a P(1) says (a + (j 1)d) = j=1 k+1 P(k+1) says (a+(j 1)d) = j=1 72 Write your proof on paper and upload a photo of it Choose File No file chosen and prove that B