1.

If (a × b)/c = (a2 + ab - b2)/ (c + a), for all natural numbers of a, b and c, then the value of (4 × 5)/7 is:1. 42. 13. 04. 3

Answer» Correct Answer - Option 2 : 1

Given: 

(a × b)/c = (a2 + ab - b2)/ (c + a)

Calculation:

According to question

(42 + 4 × 5 - 52)/ (7 + 4)

⇒ (16 + 20 – 25)/11

⇒ (36 – 25)/11

⇒ 11/11

⇒ 1

∴ (4 × 5)/7 =  (42 + 4 × 5 - 52)/ (7 + 4) = 1

The correct option is 2 i.e. 1.



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