RBC Abstract and Logical Patterns 4

Question 1

A pattern of letters reads: A, C, E, G, ___. What letter comes next?

Accepted Answer

I

Answer

The sequence skips every other letter (A, C, E, G, I), so the next letter is I.

Question 2

Each row in a table sums to the same total. Row 1: 4, 7, 9. Row 2: 6, 5, 9. What must the missing value in row 3 be if row 3 starts with 8, 3, ___?

Accepted Answer

9

Answer

Each row sums to 20, so the missing value is 20 − 8 − 3 = 9.

Question 3

A shape sequence shows increasing complexity: 1 line, 3 lines, 6 lines, 10 lines, ___. What is the next term?

Accepted Answer

15

Answer

The differences are +2, +3, +4, +5, so the next term is 10 + 5 = 15.

Question 4

In an analogy: ■■□ is to ■□■ as ●●○ is to ___.

Accepted Answer

●○●

Answer

The transformation moves the middle element to the end: ■■□ → ■□■ means the second position swaps with the third, giving ●○●.

Question 5

A clock face is used as a pattern grid. The minute hand moves +15 minutes each step: 12, 3, 6, ___. What position comes next?

Accepted Answer

9

Answer

Adding 15 minutes each time: 12 o'clock → 3 → 6 → 9.

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