railway RPF Constable Mock Test Series 2024 Quantitative Aptitude Number System LCM and HCF

If the highest common factor (HCF) of x and y is 15, then the HCF of 36x2 - 81y2 and 81x2 - 9y2 is divisible by ______.

1
135
2
120
3
180
4
90
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