Question

solve it ..........​

Answer 1

     

$\sf{Answer: (B) 3}$

$T_{12} -T_6=25-13 \\ \\ (12-6)d=12 \\ \\ 6d=12 \\ \\ d=2$

$T_6-T_1=(6-1)d \\ \\ 13-T_1=5 \times 2 \\ \\ 13-T_1=10 \\ \\ T_1=13-10 \\ \\ T_1=\bold{3}$

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