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Find tshe nth term of 25,22,19, 16 and find the sum of first 20 term |
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Answer» Step-by-step EXPLANATION: d=t2-t1 =22-25 =-3 d=t3-t2 =19-22 =-3 d=-3 a=25 S20= sn=n/2(2A(n-1)d s20=20/2(2×25(20-1)-3 =10(-7) =-70 |
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