Question

without adding find the sum a)1+3+5+7+9 b)1+3+5+7+9+11+13+15+17+19+21+23​

Answer 1

1) We will count the number of digits that is 5 and that Square of 5 is 25, so, therefore, the answer of 1st part is 25
2) 12 digits are there and square of 12 is 144 so, the answer is 144.

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Answer 2

Answer:

25,144

Step-by-step explanation:

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