Question

7. Observe the pattern given below:
23 - 13 = 1 + 2 x1 x3
33-23 = 1 + 3 x 2 x3
43 - 33 = 1 +4x3x3
Now find the value of
(a) 63-53 (b) 11 - 103
(c) 193 - 183​

Answer 1

Choose the correct option in place of question mark (?) in the following series:

2, 7, 9, 3, 8, 11, 4, 9, 13, (?), 10, 15.

(a) 3

(b) 4

(c) 5

(d) 6

Solution:

In the series when we add the first two numbers we get the third number.

2 + 7 = 9

3 + 8 = 11

4 + 9 = 13

(?) + 10 = 15; now, 15 – 10 = 5; since 5 + 10 = 15

Answer: 5

Answer 2

Answer:

(a) 63 - 53= 1+6X5X3

(c) 193-183 = 1+19X18X3