Question
Select the option that is related to the third number in
the same way as the second number is related to the first number and the sixth number is related to the fifth number. 15: 210 :: 21: ? :: 19 : 342Solution
15² - 15 = 225 – 15 = 210 19² - 19 = 361 – 19 = 342 21² - 21 = 441 – 21 = 420
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