C-13-Q055mediumsingle_mcq29+25+21+⋯+(−23)=?29 + 25 + 21 + \cdots + (-23) = ?29+25+21+⋯+(−23)=?a424242b404040c363636d4848ব্যাখ্যাHere a=29a=29a=29, d=−4d=-4d=−4; from 29+(n−1)(−4)=−2329+(n-1)(-4)=-2329+(n− we get terms. Then .