Question

mahadev.... for you just explain me how 2 step has come​

Answer 1

n/2 [108+(n-1)×-3] =513

n/2 [108-3n+3] =513

n/2 [111-3n] =513

n[111-3n] =1026 (diveded by 3)

n[37-n] =342

37n-n^2 =342

n^2 -37n+342 = 0

Answer 2

Answer:

n/2 [108+(n-1)×-3] =513

n/2 [108-3n+3] =513

n/2 [111-3n] =513

n[111-3n] =1026 (diveded by 3)

n[37-n] =342

37n-n^2 =342

n^2 -37n+342 = 0

hope it's help

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Nitya❣️