Question

7 3 4
5 6 ?
2 3 8
33 10 33
Find the question mark number

Answer 1

Answer:

13

Step-by-step explanation:

Given  

7   3  4

5   6  ?

2   3  8

33 10 33

Now according to series we can write this as  

(7 – 1) x (5 + 1) – (2 + 1)

= 6 x 6 – 3

= 33

(3 – 1) x (6 + 1) – (3 + 1)

= 2 x 7 – 4

= 10

Now (4 – 1) x (a + 1) – (8 + 1)  = 33

3 x (a + 1) – 9 = 33

 3a + 3 – 9 = 33

 3a – 6 = 33

3a = 39

So a = 13

Now the missing number in the series is 13

Answer 2

The question mark number is "13".

Step-by-step explanation:

To find, the missing number = ?

The pattern follow column-wise,

(First term - 1)(Second term + 1) - (Third term - 1) = Fourth term

In first column,

$(7-1) \times (5+1)-(2+1)$

$=6\times 6-3= 33$

In second column,

$(3-1) \times (6+1)-(3+1)[=2\times 7-4= 10$

Similarly,

In third column,

$(4-1)\times (? + 1)-(8 + 1)=33$

⇒$3\times (?+1)-9 = 33$

 ⇒$3(?)+3-9 = 33$

 ⇒ $3(?) = 33+6=39$

⇒ ? = $\dfrac{39}{3} =13$

Hence, the question mark number is 13.