All the numbers from 105 to 498 are listed down in the ascending order Ramu picks up every seventh n...........

Quantitative Aptitude ( CCS) Number System

All the numbers from 105 to 498 are listed down in the ascending order. Ramu picks up every seventh number starting from 105 and prepares a list of these numbers. Ramu's assistant sums up all the numbers in this list. What is the total sum so obtained?

11757

17757

17157

71157

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Explanation:

first digit=105
105,112,119....
Tn=a+(n-1)d = 105+(n-1)7
here for n=57 ,,last digit will be 497,,
beyond n=57,,,d value of Tn will go beyond 498,,dat is nt allowed,,
so sum will be
Sn=n/2(2a+(n-1)d)
57/2(210+7(56))
17157

Hence, option 3 is the correct answer.