"OUR GREAT MATHEMATICIANS "

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Across
  1. 4. an Indian recreational mathematician who
  2. 6. Introduction of zero (0) to mathematics
  3. 7. He also gave the formula(a + b)2= a2 + b2
Down
  1. 1. most significant contribution in statistic
  2. 2. several classes of natural
  3. 3. one of India’s greatest mathematical
  4. 5. famous for his “theory of estimation”.