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The sum of the first 50 positive integers is 1, 275. What is
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18 Dec 2020, 11:02
18 Dec 2020, 11:02
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The sum of the first 50 positive integers is 1, 275. What is the sum of the integers from 51 to 100.
(A) 2, 525
(B) 2, 550
(C) 3, 250
(D) 3, 775
(E) 5, 050
Kudos for the right answer and explanation
(A) 2, 525
(B) 2, 550
(C) 3, 250
(D) 3, 775
(E) 5, 050
Kudos for the right answer and explanation
Re: The sum of the first 50 positive integers is 1, 275. What is
[#permalink]
18 Dec 2020, 20:20
18 Dec 2020, 20:20
1
Sum of the first 50 positive integers is given.
S50 = 1275
The formula to get Sum when first and last term is known is given below,
Sn = n/2(a+l)
where n= no of integers , a = first term , l = last term
Here n=100 , a=1 , l=100
S100 = 100/2(1+100) = 5050
Now to get the sum of 51 to 100, let's subtract S50 from S100
= 5050 - 1275
= 3775
Answer : D
S50 = 1275
The formula to get Sum when first and last term is known is given below,
Sn = n/2(a+l)
where n= no of integers , a = first term , l = last term
Here n=100 , a=1 , l=100
S100 = 100/2(1+100) = 5050
Now to get the sum of 51 to 100, let's subtract S50 from S100
= 5050 - 1275
= 3775
Answer : D
gmatclubot
Re: The sum of the first 50 positive integers is 1, 275. What is [#permalink]
18 Dec 2020, 20:20
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