Question

5. Without actual adding, find the sum:
(a) + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19
(b) 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 2 + 23 + 25​

Answer 1

Step-by-step explanation:

a) 81

b) 169

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Answer 2

5.

a)99

b)149

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