00447nam a2200169 a 450000500170000002000180001708200130003510000220004824500860007026000250015630000210018160000080020263000390021063000160024985600060026585600060027120251219160005.0  a9789392837777  a515bTYA  aTyagi, Praveend_  aSecrets behind faster calculationsbtrain your brain to become a human calculator  aNew DelhibGKPc2024  f152p.c18cm.bPB  bc_  aSecrets behind faster calculations  aCalculation  f_  a_