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GCMAS (Global Concept of Mental Arithmetic System)

F-6, Kamala Nivas,Kamala Nagar, Road no-3,

Chaitanyapuri, Dilsukhnagar.

Hyderabad – 500 060, Telangana, India..

Ph:  09908899048, 9246571920,

Email : info@gcmas.in, gcmas@hotmail.com

website : www.gcmas.in