Question

17,21,9,26,18,?,13,5 find the missing number​

Answer 1

Answer:

..18 is left ..

plz tell me that this is correct

Answer 2

$\huge \bold \purple { | hello \: babes | } \\ \mathfrak \red {here \: is \: ur \: answer}$
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18 is the number should be in the missing place.

$\bold \green {given - }$

In series 17, 21, 9, 26, 18, ?, 13,5

$\bold \green {solution - }$

From Left to Right 21- 17 = 4  
Hence, From Right to Left last term = 4+1 =5
From Left to Right 21- 9 = 12
Hence, From Right to Left second last term = 12+1 =13
From Left to Right 26 - 9 = 17  
Hence, From Right to Left Third last term = 17+1 =18

Hence in the place of question mark (?) we can put 18.
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