301=5+(n-1)*6
306=6n-1
how "6n-1" came
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if you see before brackets there is sign of + and where 6 is present there is no sign of + ,there is sign of multiply so 6(n-1)
6*n=6n and 6*-1=-6
so 6n-6
6*n=6n and 6*-1=-6
so 6n-6
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