C-13-Q041mediumsingle_mcqThe 121212th term of the series 2,−5,−12,−19,…2, -5, -12, -19, \ldots2,−5,−12,−19,… is —a−72-72−72b−75-75−75c−79-79−79d−68-68−68ব্যাখ্যাHere a=2a=2a=2 and d=−7d=-7d=−7, so the nnnth term is a+(n−1)da+(n-1)da+(n−1)d. The 121212th term =2+(12−1)(−7)=2−77=−75=2+(12-1)(-7)=2-77=-75=2+(12−1)(−7)=2−77=−75.