Question

5×8=28, 3×7= 12, 8×6=35, then 13×13=? your options are a)169 b)140 c)144 d ) 130 with brief explanation iwiil mark u as brilliant​

Answer 1

Answer:

(c) 144

Step-by-step explanation:

5×8 = 4×7 = 28

3×7 = 2× 6 = 12

8×6 = 7× 5 = 35

Then ,

13×13= 12×12 = 144

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Answer 2

Given:

If 5×8 = 28, 3×7= 12, 8×6=35

To Find:

13x13 = ?

Solution:

We have,

5 × 8 = 28

This can be written as

5 x 8 = (5 - 1) x (8 - 1) = 4 x 7 = 28

Similarly,

3 x 7 = (3 - 1) x (7 - 1) = 2 x 6 = 12

Also,

8 x 6 = (8 - 1) x (6 - 1) = 7 x 5 = 35

Then ,

13 x 13 = (13 - 1) x (13 - 1) = 12 x 12 = 144

Hence, 13 x 13 = 144 (option c).