Arithmetic sequence nth theorem formula
"a_n=a_1+(n-1)d\\\\\na_6=24=a_1+(6-1)d \\implies a_1+5d=24......(1)\\\\\na_{11}=39=a_{11}+(11-1)d \\implies a_1+10d=39......(2)\\\\\nAdding \\space 1 \\& 2\\\\\nd= 3\\\\\na_1=9\\\\\nSo, a_{17}=9+(17-1)*3=57"
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