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Mixed Series - Intermediate Level: symbol sequences INTERMEDIATE

Quick mental agility ★ session: 20 intermediate-level mixed series questions. Worksheet 17 of 30 - Focus: symbol sequences. Practice symbol sequences, mixed character series, pattern recognition with instant feedback. Great for mid-level students needing moderate complexity with mixed patterns practice.

📝 Worksheet 17 of 30 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Intermediate level

What you'll learn in this worksheet:
Your progress through Mixed Series
Worksheet 17 of 30 (56% complete)

Question 1

Find the next item in the series: 8, G, 21, I, ?
Fibonacci sequence (8, 13, ...) with position-based letters. Next Fibonacci number is 55, so answer is 55
fibonacci, letters

Question 2

Find the next item in the series: 64, D, 125, E, 216, F, ?
Alternating perfect cubes (starting from 4³=64) and corresponding letters. Next is 343
cubes, letters

Question 3

Find the next item in the series: U, 3, O, 6, I, 9, ?
Numbers increase by 3, vowels reverse A-E-I-O-U pattern. Next is E
arithmetic, vowels

Question 4

Find the next item in the series: 1, A, 2, C, 5, ?
Fibonacci sequence (1, 1, ...) with alternating numbers/letters. Next Fibonacci number is 8, so answer is H
fibonacci, letters

Question 5

Find the next item in the series: B, 3, D, 5, F, ?
Alternating between letters and their positions in alphabet (A=1, B=2, ...). Letters advance by 3 each time. Next is 7
alphabet, position

Question 6

Find the next item in the series: 4, B, 8, A, 16, Z, ?
Alternating series: numbers follow multiplying by 2 pattern, letters follow backward by 1 pattern. Next number is 32
alternating, basic

Question 7

Find the next item in the series: 15, P, 17, R, 19, ?
Alternating between letters and their positions in alphabet (A=1, B=2, ...). Letters advance by 3 each time. Next is T
alphabet, position

Question 8

Find the next item in the series: 4, D, 16, P, 64, L, 256, ?
Alternating powers of 4 (4^1=4, 4^2=16, ...) and corresponding letters. Next is V
power, exponential, letters

Question 9

Find the next item in the series: I, 9, A, 27, C, 81, ?
Alternating powers of 3 (3^2=9, 3^3=27, ...) and corresponding letters. Next is I
power, exponential, letters

Question 10

Find the next item in the series: K, 2, N, 8, Q, 32, ?
Numbers multiply by 4, letters advance by 3. Next is T
geometric, alphabet

Question 11

Find the next item in the series: Q, 59, R, 61, ?
Alternating prime numbers and consonants. Next is S
primes, consonants

Question 12

Find the next item in the series: P, 16, L, 64, V, 256, J, ?
Alternating powers of 4 (4^2=16, 4^3=64, ...) and corresponding letters. Next is 1024
power, exponential, letters

Question 13

Find the next item in the series: 1, A, 8, B, 27, ?
Alternating perfect cubes (starting from 1³=1) and corresponding letters. Next is C
cubes, letters

Question 14

Find the next item in the series: 5, A, 3, E, 3, I, 8, ?
Two independent patterns: numbers follow fibonacci progression, letters follow vowel-cycle pattern. Next letter is O
double, interleaved

Question 15

Find the next item in the series: 8, U, 12, Y, 16, C, ?
Alternating series: numbers follow increasing by 4 pattern, letters follow forward by 4 pattern. Next number is 20
alternating, basic

Question 16

Find the next item in the series: M, 2, O, 4, Q, 8, ?
Numbers multiply by 2, letters advance by 2. Next is S
geometric, alphabet

Question 17

Find the next item in the series: B, 4, C, 9, D, 16, E, ?
Alternating perfect squares (starting from 2²=4) and corresponding letters. Next is 25
squares, letters

Question 18

Find the next item in the series: 2, C, 4, E, 8, I, ?
Numbers multiply by 2, letters advance by 1. Next is 16
geometric, alphabet

Question 19

Find the next item in the series: 1, K, 3, M, 5, O, ?
Alternating series: numbers follow Fibonacci-style (1, 2, ...) pattern, letters follow forward by 2 pattern. Next number is 8
alternating, basic

Question 20

Find the next item in the series: 2, O, 6, U, 24, ?
Alternating factorial numbers (2, 6, ...) and vowels in forward order. Next is A
factorial, vowels
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