Topic- वैश्विक महामारी से जुझते करमवीर और हम।
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Let \displaystyle {a_n}an be a finite arithmetic progression and k be a natural number. \displaystyle a_1=r < 0a1=r<0 and \displaystyle a_k=0ak=0. Find \displaystyle S_{2k-1}S2k−1 (the sum of the first 2k-1 elements of the progression).
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