solution plzzzz solv plz
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a=6
d=13-6= 7
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A12= a+( n-1) d
6+(12-1)7
6+11×7
6+77
83
sum of first 12 term
Sn= n/2( a+( n-1)d
S12= 12/2(6+(12-1)7)
6(6+(11)7
6 (6 + 77)
6×83
=498
hope it helps....
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