Question

Number series 7,13,?,35,54

Answer 1

Answer:

22

Step-by-step explanation:

7×13/7=13

similarly 13×22/13=22

Answer 2

The value of missing number(?) is equal to "22".

Step-by-step explanation:

The given number series are

7, 13, ?, 35, 54

The pattern follow:

$2\times x -1^{2} ,2\times x -2^{2} ,2\times x -3^{2} ,2\times x -4^{2},....$

$13 = 2\times 7 -1^{2}=14-1=13$

$? = 2\times 13 -2^{2}=26-4=22$

$35 = 2\times 22 -3^{2}=44-9=35$

$54 = 2\times 35 -4^{2}=70-16=54$

The missing number(?) is 22.

Hence, the value of missing number(?) is equal to 22.