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How many numbers in the sequence 16, 18, 20, 22, 24..... should be taken to get an average 100

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by kpkarthik

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by kpkarthik

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Sum of n numbers = n/2 (2a+(n-1)d)

⇒ 85/2(2*16+(84)2)

⇒ 85/2(32+168)

⇒ 85/2(200) =8500.

Average = 8500/85 =100.

So the answer is