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ВОРОТА | GATE-CS-2014- (Set-2) | Вопрос 65

Каково среднее значение всех кратных 10 от 2 до 198?
(А) 90
(Б) 100
(С) 110
(D) 120

Ответ: (Б)
Объяснение:

From 2 to 198 there are 19 multiples of 10.

These are 10,20,30.....180,190.

This is an A.P series, whose sum is (n/2{a1 + aN}), 
where a1 and aN are the 1st and last terms respectively.

Putting in the formula,

a1 = 10, aN = 190.

Sum = Sn = (19/2{10 + 190 }) = 1900

Average = Sum / Total number = 1900 / 19 = 100. 

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ВОРОТА | GATE-CS-2014- (Set-2) | Вопрос 65

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