1+3+5+7+9+11+13+15 without add the sum
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Its an AP.
First Term (a) = 1
Common Difference (d) = 2
Number of terms = 8
Sum = n/2(2a + (n-1)d)
= 8/2 (2*1 +(8-1)2)
= 4(2 + 7*2)
= 4(2 + 14)
= 4(16)
= 64
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