Question

1+3+5+7+9+11+13+15 without add the sum

Answer 1

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