Question

2,1,2;21,22;?;1,2,5;20,23,43​

Answer 1

Question :-

2 1 2

21 22 ?

1 2 5

20 23 43

find the value at ? .

Solution :-

Logic :- in each column :- (1st number - 3rd number) + fourth number = second number .

Check :-

first column :- 2, 21, 1 , 20

→ 1st number - 3rd number = 2 - 1 = 1

→ 1 + fourth number

→ 1 + 20

→ 21 = second number.

Similarly,

second column :- 1, 22, 2 , 23

→ 1st number - 3rd number = 1 - 2 = (-1)

→ (-1) + fourth number

→ (-1) + 23

→ 22 = second number.

Therefore, we will apply same in Next ,

Third column :- 2, ?, 5 , 43

→ 1st number - 3rd number = 2 - 5 = (-3)

→ (-3) + fourth number

→ (-3) + 43

→ 40 = second number = ? (Ans.)

Learn more :-

423:24::534:60::752:70::245:?

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Use inductive reasoning to determine the next two terms in the sequence:

A , 6 , D , 16 , H , 46 , M , 136

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Answer 2

Answer:

2,1,2,21,?,1,2,5,20,23,43