Reverse Coding-Editorial

Practice

In case the contest did not have two separate pages for Div-1 and Div-2, you can delete one of these above lines.

Author: Setter’s name
Tester: Tester’s name
Editorialist: Editorialist’s name


RC_Q1 :Find the incorrect term in the series:1,9,25,57,81,121

A: 57(odd squares)



RC_Q2:1,144,15129,_

A: 1522756 (1, 1212, 123123, 12341234)



RC_Q3:Find the incorrect term in the series:1,8,7,4,9,6

A: 9(last digit of cubes of natural numbers)



RC_Q4:31,28,31,30,_

A: 31(no. of days in a month)



RC_Q5: 0,0,3,20,115,_

A: 714(N! - N)



RC_Q6: [2,3,4] = 11, [6,1,5] = 31, {4,9,3} = 3, {7,4,2} = 10, {8,7,5} - [3,6,9] = ?

A: 0 ([A,B,C] = A
C + B {A,B,C} = A*C - B)



RC_Q7: APPLE : 2

BERRY : 1

CARROT : 2

DATES : ?

A: 2(No. of vowels in word)



RC_Q8: 1 : 3

2 : 3

3: 5

4 : ?

A:4(No.of letters in word representation)


RC_Q9: DHONI : 49171713

VIJAY : 21932519

BRAVO : 221012429

JADDU : ?



A: 1026725(letter code + index of letter)



RC_Q10: DELHI : IJQMN

MUMBAI : SASHGO

PUNE : TYRI

CHENNAI : ?



A: JOLUUHP (letter code + length of word)

RC_Q11 : Find the incorrect term in the series : 5, 8, 12, 18, 20, 30, 36, 42

A: 20 (sum of 2 consecutive prime numbers)



RC_Q12 : 0, 6, 24, 60, 120, 210, __

A: 336 (N^3 - N)



RC_Q13 : 784, 706, 636 , 573, 516,__

A: 465 (​Each number is obtained by subtracting the first two terms of its previous number from its previous number.784-78 = 706 and so on…)



RC_Q14: Y1B, W2E, U6H, S21K, Q88N, O445Q, _____(Answer is alphanumeric)

A: ​M2676T (The patterns followed by the letters is: 1st letter: The letter is
decremented by 22nd letter: The letter is incremented by 3.
The series formed by the numericals (i.e., 1, 2, 6, 21, 88, 445) follow the pattern
x1 + 1 , x 2 + 2 , x 3 + 3, x 4 + 4 , …)


RC_Q15: Find the incorrect term in the series:7,28,64,126,215,344

A: 64(odd terms = n^3 - 1, even terms = n^3 + 1)


RC_Q16: VAGUE : 8

QUEEN : 9

IGLOO : 11

ROGUE : ?



A: 11(A=1, E=2, I=3, O=4, U=5 : sum of vowels)



RC_Q17: MADRAS : 2

GUWAHATI : 0

ROORKEE : 1

DELHI : ?

A: 1 (number of vowels in the word - number of consonants in the word)


18) RONALDO : SQQEQJV

MESSI : NGVWN

POGBA : QQJFF

RAMOS : ?

A: SCPSX (Each letter is incremented by its corresponding position in the
word.Ex: MESSI → NGVWNM is incremented by 1, E is incremented by 2 and so on… )

RC_Q19: 9&2 = 19, 9@3 = 26, (4&5)@(2&6) = ?

A: 272 (& : multiply and add 1, @ multiply and subtract 1)