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Sunaina Pati from Sarala Birla Gyan Jyoti, Guwahati
Subject :IMO    Class : Class 6
What is 1+2+3+4+5+6+7+8+9+10 + 11+....................+90 ?

Ans 1:

Kusumanchi Vinay from narayana etechno school,madhapur,hyderabad, Hyderabad
Class : Class 6

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