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How many terms of ap21,18,15.... must be added to get the sum of 0plz help me give correct answer plz my friends |
Answer» Answer:15.Step-by-step EXPLANATION: a = 21. d = –3. Sum = 0 (n/2)[2a+(n-1)d] = 0 n[2(21)+(n-1)(-3)] =0 n[42-3n+3] = 0 n[ 45-3n] = 0. n=0{NOT POSSIBLE}. 45-3n =0. 3n = 45 n= 15. |
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