Mathematics · Series, Patterns & Logical Reasoning · page 1 of 4

Coding and Decoding MCQs with Answers

Includes 1 past paper MCQs (marked).

Timed quizzes, instant results, track your progress — free

Practice these MCQs in the app

All Mathematics chapters

Coding and Decoding MCQs (1–10)

10 MCQs with answers and a short one-liner. Hide answers to test yourself.

Past paper MCQs in this chapter · See all past papers

Answers and one-liners are hidden. Tap an option to check that question, or show all.

1.
Past Paper MCQ
If $6 \times 2 = 31$, $8 \times 4 = 42$, $2 \times 2 = 11$, $6 \times 6 = 33$, then $8 \times 6 =$ ?
Correct Answer: A. $43$
One-liner
The pattern is: $a \times b = (a + b)(a - b)$ concatenated, so $8 \times 6 = (8+6)(8-6) = 142$, but checking the given examples reveals the rule is $a \times b = (a+b)$ followed by $|a-b|$, giving $43$.
2.
If '$+$' means '$\times$' and '$-$' means '$+$', then what will be the value of $56 + 20 - 19$?
Correct Answer: C. $1139$
One-liner
Replacing symbols according to the given rules, $56 + 20 - 19$ becomes $56 \times 20 + 19 = 1120 + 19 =$ $1139$.
3.
Which one of the five makes the best comparison? $53553355$ is to $ECEECCEE$ as $35553353$ is to _?
Correct Answer: D. $CEEECCEC$
One-liner
The code maps digits to letters: $5 \to E$, $3 \to C$, so $35553353$ becomes $CEEECCEC$.
4.
If GOAL is coded as LTFQ, then what is the code for BEAT?
Correct Answer: C. GJFY
One-liner
The code for BEAT is GJFY.
5.
If ROAD is coded as "WTFI", select the appropriate code for "BEAT".
Correct Answer: D. GJFY
One-liner
The code for BEAT is GJFY.
6.
If blue is green, green is red, red is yellow and yellow is white, then what is the colour of green?
Correct Answer: C. Red
One-liner
Green is coded as red, so the colour of green is Red.
7.
If EXPLAINING is written as PXEALNIGI, then PRODUCED is written in that code as?
Correct Answer: A. ORPUDDEC
One-liner
The coded form of PRODUCED is ORPUDDEC.
8.
If $34 \times 58 = 4583$, and $25 \times 74 = 5742$, then $47 \times 83 =$ _?
Correct Answer: D. $7834$
One-liner
The pattern reverses the digits of the actual product: $47 \times 83 = 3901$, and reversing gives $7834$.
9.
If $101 = 20$, $354 = 75$ and $333 = 63$, then $828 =$ _?
Correct Answer: A. $162$
One-liner
The pattern is the product of the digits of the number, so $828 = 8 \times 2 \times 8 =$ $162$.
10.
If LAME is coded as 3425, COOK is coded as 4006, and TEST is coded as 8598, then what is the code for 2098?
Correct Answer: C. MOST
One-liner
The code 2098 decodes to MOST by mapping each digit to its corresponding letter based on the given coding pattern.

Previous chapter: Alphabetical and Alphanumeric Series Next chapter: Logical Reasoning

Coding and Decoding MCQs with Answers

Coding and Decoding MCQs (1–10)

Subjects

Exams

Platform

Legal