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Which of the following is equal to 21^2 + 22^2 + 23^2 + 24^2 + 25^2 +

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Posts: 50580
Which of the following is equal to 21^2 + 22^2 + 23^2 + 24^2 + 25^2 +  [#permalink]

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New post 25 Apr 2016, 03:05
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

82% (01:26) correct 18% (02:15) wrong based on 42 sessions

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Re: Which of the following is equal to 21^2 + 22^2 + 23^2 + 24^2 + 25^2 +  [#permalink]

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New post 25 Apr 2016, 05:14
1
Bunuel wrote:
Which of the following is equal to 21^2 + 22^2 + 23^2 + 24^2 + 25^2 + 26^2?

A. 2,925
B. 2,924
C. 2,932
D. 3,331
E. 4,030


No need to do actual calculation finding units digit will be sufficient to deal with this problem.

21^2 will have units digit as 1

22^2 will have units digit as 4

23^2 will have units digit as 9

24^2 will have units digit as 6

25^2 will have units digit as 5

26^2 will have units digit as 6

Now, add those ( 1 + 4 + 9 + 6 + 5 + 6 ) answer will be (D) 31
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Re: Which of the following is equal to 21^2 + 22^2 + 23^2 + 24^2 + 25^2 +  [#permalink]

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New post 12 Sep 2018, 23:08
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Re: Which of the following is equal to 21^2 + 22^2 + 23^2 + 24^2 + 25^2 + &nbs [#permalink] 12 Sep 2018, 23:08
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