4. Without actual addition, find the sum of the following:
(a) 1 + 3 + 5+7 (b) 1 + 3 + 5 + 7+ 9 + 11 + 13
Answers
Answered by
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Step-by-step explanation:
a=1+3+5+7=16 b=1+3+5+7+9+11+13=49..pls brainlist my answer
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