Q.

Between the numbers 2 and 20, 8 means are inserted, then  their sum is

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a

88

b

44

c

176

d

None of these

answer is A.

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Detailed Solution

Let a ,A1,A2....A8,b∈A.P Where a=2,b=20,n=8∴   sum of the means =n2(a+b)=82(2+20)=88
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