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10
Mark for Review

nPattern
11
21 + 3
31 + 3 + 5
41 + 3 + 5 + 7
51 + 3 + 5 + 7 + 9

The table above gives the values of a sum of the first n numbers, starting with 1. Which of the following is a correct statement about n?

A

B

C

D


Correct Answer: C

Your Answer:

Explanation

(C) Rewrite the table by calculating the actual sums:

nPatternSum
111
21 + 34
31 + 3 + 59
41 + 3 + 5 + 716
51 + 3 + 5 + 7 + 925

Each value in the "Sum" column is the corresponding value of n squared: 1 = 12; 4 = 22; 9 = 32; 16 = 42; 25 = 52