Q6.The sum of successive odd numbers 1, 3, 5, 7, 9, 11, 13 and 15 is
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we have to add 1, 3, 5, 7, 9, 11, 13, 15
=1+3+5+7+9+11+13+15
=4+5+7+9+11+13+15
=9+7+9+11+13+15
=16+9+11+13+15
=25+11+13+15
=36+13+15
=49+15
=64
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