Question

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find the sum of 1+3+5+.................+51 without actually addition

Answer 1

Answer:

A=1.An=51..... N=1+(n-1)2=51.......N=26..........put values in formula n/2(A+An)=26/2(1+51)=26x26=676...........

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Answer 2

Answer:

625

Use the AP formulas as shown in the attachment.

hope it helps.