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"If "|a|lt1,|b|lt1, then find the sum to infinity of the following series : (i) (a+b )+(a^(2)+ab+b^(2))+(a^(3)+a^(2)b+ab^(2)+b^(3))+...oo (ii) 1+(1+a)b+(1+a+a^(2))cdotb^(2)+...oo |
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