If the sum of the first $12$ terms of an arithmetic series is $144$ and the sum of the first $20$ terms is $560$, the su

Question

If the sum of the first $12$ terms of an arithmetic series is $144$ and the sum of the first $20$ terms is $560$, the sum of the first $6$ terms is —

Accepted Answer

$0$

Answer

$36$

Answer

$72$

Answer

$144$

If the sum of the first 121212 terms of an arithmetic series is 144144144 and the sum of the first 202020 terms is 560560560, the sum of the first 666 terms is —