1.

5. Find the sum of first 16 terms of A.P. 10, 6, 2....ha

Answer»

sn=n/2(2a+(n-1)d)n=16,a=10,d=-4s16=16/2(2(10)+(16-1)-4)s16=8(20-60)s16=8(-40)s16=-320



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