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Number analogy: second = square root of first plus or minus 1

This type of question, asked 3 times: 18 Jul 2023 S4, 21 Jul 2023 S2, 25 Jul 2023 S2. All 3 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    18 Jul 2023 S4

    19
    Select the option that is related to the fifth term in the same way as the second term is related to the first term and the fourth term is related to the third term. 121 : 10 :: 256 : 15 :: 441 : ?

    Tap an option to check your answer.

  2. Question 2

    21 Jul 2023 S2

    25
    Select the option that is related to the fifth term in the same way as the second term is related to the first term and the fourth term is related to the third term. 121 : 12 :: 225 : 16 :: 441 :?

    Tap an option to check your answer.

  3. Question 3

    25 Jul 2023 S2

    1
    Select the option that is related to the fourth term in the same way as the first term is related to the second term and the fifth term is related to the sixth term. 169 : 14 :: ? : 16 :: 289 : 18

    Tap an option to check your answer.