5. Find the sum without actual addition,
(a) 1 + 3
(b) 1 + 3 + 5 + 7
(c) 1 + 3 + 5 + 7 + 9 + 11
(d) 1 + 3 + 5 + 7 + 9 + 11 + 13.
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5. Find the sum without actual addition,
(a) 1 + 3
(b) 1 + 3 + 5 + 7
(c) 1 + 3 + 5 + 7 + 9 + 11
(d) 1 + 3 + 5 + 7 + 9 + 11 + 13.
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