self Maths Puzzle

a+b+c+d=d+e+f+g=g+h+i=17 , where a-i values will be 1-9. take a=4 and find d and g values.

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self Other Question

8 eager students are in line to take their seats in the first row, which has exactly 8 chairs. The student decides that the first person could pick any chair to sit on. For the rest, they have to pick a seat that is immediately next to another seated student. How many ways are there for the students to seat themselves according to this method? 17,30,44,64,98,__,__