434 – 4^2 = 418

418 – 5^2 = 393

393 – 6^2 = 357

357- 7^2 =308

308- 8^2 = 244

84/1.2 = 70 + 2 = 72

72/1.2= 60 + 6 = 66

66/1.2 = 55 + 10 = 65

65/1.2 = 54.17 + 14 = 68.17

156 + 11 = 167

167 + 22 =189

189 + 33 =222

222 + 44 = 266

266 + 55 = 321

97 x 1 + 2 = 99

99/2 – 4 = 45.5

45.5 x 3 + 6 = 142.5

142.5/4 – 8 = 27.625

27.62500 x 5 + 10 = 148.125

14 – 7= 7 => 7 X 1 = 7 => 7 + 1 = 8

8 – 6 = 2 => 2 X 2 = 4 => 4 + 1 = 5

5 – 5 = 0 => 0 X 3 = 0 => 0 + 1 = 1

1 – 4 = -3 => -3 X 4 = -12 => -12 + 1 = -11

-11 – 3 = -14 => -14 X 5 = -70 => -70 + 1 = -69

-69 – 2 = -71 => -71 X 6 = -426 => -426 + 1 = -425

-2 X 5.5 + (-1) X 4.5 = -15.5

0 X 3.5 + 1 X 2.5 = 2.5

2 X 1.5 + 3 X 0.5 = 4.5

4 X (-0.5) + 5 X (-1.5) = -9.5

6 X (-2.5) + 7 X (-3.5) = -20.5

8 X (-4.5) + 9 X (-5.5) = -85.5

12.4 X 2.5 -3 = 28

28 X 1.5 – 2 = 40

40 X 0.5 – 1 = 19

19 X (-0.5) – 0 = -9.5

-9.5 X (-1.5) + 1 = -13.25

12 + 32 = 10 => 10 X 1 = 10

32 + 52 = 34 => 34 X 2 = 68

52 + 72 = 74 => 74 X 3 = 222

72 + 92 = 130 => 130 X 4 = 520

92 + 112 = 202 => 202 X 5 = 1010

From matrix,

Column wise:

(8 + 7) x 6 = 90

( 7 + 6 ) x 5 = 65

So, (6 + 5) x 4 = 44.

From matrix, column wise:

Column 1 : 6 x 8 + 3 = 51

Column 2 : 15 x 4 + 5 = 65

Column 3 : 20 x 5 + 20 = 120(missing number)

The numbers in the lower circles equal the numbers in corresponding segments in the upper circles multiplied by two, then subtract 3 for the left hand circle, 4 for the middle and 5 for the right hand circle.

Explanation: Clearly, the number in the inner part of the figure is the difference between the positions of the letters in the outer part of the figure.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
W – T => 23 – 20 = 3
S – D => 19 – 4 = 15
T – J => 20 – 10 = 10
Similarly,
P – G => 16 – 7 = 9 (missing number)
Thus, the correct answer is option C.

Split the left and right-hand circles in half, vertically.

The sum of the numbers in the left-hand half of the left circle appears in the top left-hand segment of the middle circle, and the sum of the numbers in the right-hand half of the left-hand circle appears in the bottom left-hand segment of the middle circle.

Repeat this pattern for the right-hand circle.

Explanation: Here, the number inside the circle is equal to the square of the sum of all the numbers outside the circle.
7 + 1 + 2 + 3 = 13 and 132 = 169
5 + 1 + 2 + 3 = 11 and 112 = 121
Similarly,
6 + 1 + 4 + 5 = 16 and 162 = 256 (missing number)
Thus, the correct answer is option C.

The pattern is  5×2 -1 =9,9×2-1=17,17×2-1=33,33×2-1=65,65×2-1=129,129×2-1=257
257×2-1=513, 513×2-1=1025  so answer is option A.