1987, TATA McGRAW-HILL PUBLISHING COMPANY LIMITED
fourth reprint 1991
RQRQCRBMRLDAL
no part of this publication can be reproduced in any form or by any means without the prior written permission of the publishers.
this edition can be exported from India only by the publishers tata mcgraw-hill publishing company limited.
published by tata mcgraw-hill publishing company limited
4/12, Asaf Ali Road, new dehli 110 002 and printed at rekha printers Pvt. Ltd., new dehli-110 020