🔴Number System 01(āĻ¸āĻ‚āĻ–ā§āĻ¯āĻž āĻĒāĻĻā§āĻ§āĻ¤āĻŋ)| SSC CGL GD RAILWAY MATHS PYQ SERIES | NTPC, RPF,GROUP-D| SAMIR SIR