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Mixed Series - Intermediate Level: dual progression INTERMEDIATE

Boost your speed and accuracy with this adaptive style 📈 worksheet. Worksheet 15 of 30 presents 20 intermediate-level mixed series problems. Focus on dual progression while practicing alphanumeric patterns, letter-number combinations, symbol sequences. Difficulty: moderate complexity with mixed patterns. Perfect for mid-level test takers.

📝 Worksheet 15 of 30 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Intermediate level

What you'll learn in this worksheet:
Your progress through Mixed Series
Worksheet 15 of 30 (50% complete)

Question 1

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

Question 2

Find the next item in the series: 2, C, 5, H, 13, ?
Fibonacci sequence (2, 3, ...) with alternating numbers/letters. Next Fibonacci number is 21, so answer is U
fibonacci, letters

Question 3

Find the next item in the series: 6, O, 24, I, 120, ?
Alternating factorial numbers (6, 24, ...) and vowels in reverse order. Next is E
factorial, vowels

Question 4

Find the next item in the series: H, 3, I, 12, J, 48, ?
Numbers multiply by 4, letters advance by 1. Next is K
geometric, alphabet

Question 5

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

Question 6

Find the next item in the series: 9, E, 16, G, 25, I, ?
Alternating perfect squares (starting from 3²=9) and position-based letters. Next is 36
squares, letters

Question 7

Find the next item in the series: A, 27, C, 81, I, ?
Alternating powers of 3 (3^3=27, 3^4=81, ...) and corresponding letters. Next is 243
power, exponential, letters

Question 8

Find the next item in the series: 3, A, 9, E, 27, I, 81, ?
Two independent patterns: numbers follow geometric progression, letters follow vowel-cycle pattern. Next letter is O
double, interleaved

Question 9

Find the next item in the series: F, 2, G, 6, H, 18, ?
Numbers multiply by 3, letters advance by 1. Next is I
geometric, alphabet

Question 10

Find the next item in the series: U, 8, O, 10, I, 12, ?
Numbers increase by 2, vowels reverse A-E-I-O-U pattern. Next is E
arithmetic, vowels

Question 11

Find the next item in the series: 19, F, 23, G, 29, ?
Alternating prime numbers and consonants. Next is H
primes, consonants

Question 12

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

Question 13

Find the next item in the series: 5, H, 13, U, 34, ?
Fibonacci sequence (5, 8, ...) with alternating numbers/letters. Next Fibonacci number is 55, so answer is C
fibonacci, letters

Question 14

Find the next item in the series: K, 3, L, 9, M, 27, ?
Numbers multiply by 3, letters advance by 1. Next is N
geometric, alphabet

Question 15

Find the next item in the series: 1, J, 6, H, 11, F, ?
Alternating series: numbers follow Fibonacci-style (1, 5, ...) pattern, letters follow backward by 2 pattern. Next number is 17
alternating, basic

Question 16

Find the next item in the series: 4, Q, 12, M, 36, I, 108, ?
Two independent patterns: numbers follow geometric progression, letters follow backward pattern. Next letter is E
double, interleaved

Question 17

Find the next item in the series: 3, B, 3, C, 3, D, 6, ?
Two independent patterns: numbers follow fibonacci progression, letters follow consonant-cycle pattern. Next letter is F
double, interleaved

Question 18

Find the next item in the series: 2, A, 4, E, 4, I, 6, ?
Two independent patterns: numbers follow fibonacci progression, letters follow vowel-cycle pattern. Next letter is O
double, interleaved

Question 19

Find the next item in the series: 1, B, 3, E, 8, ?
Fibonacci sequence (1, 2, ...) with alternating numbers/letters. Next Fibonacci number is 13, so answer is M
fibonacci, letters

Question 20

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