railway RRB JE (CBT I + CBT II) Mock Test 2024 Quantitative Aptitude Algebra Identities

दो समीकरणों x – 4y = 0 और 4x + 3y = 19 का एक हल (a, b) है। \(\frac{{ab}}{{a\; + \;4b}}\) का मान ज्ञात कीजिये।

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