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ch4aika [34]
3 years ago
7

Find the sum of the following without actually adding: 1+3+5+7+9+11+13+15

Mathematics
2 answers:
-Dominant- [34]3 years ago
7 0

Answer:

Step-by-step explanation:

The following numbers are successive odd numbers.

The sum of successive odd numbers (starting from 1) is always the square of number of terms you are adding.

Hear there are 8 terms. Square of 8 is 64.

Hence the sum of this numbers is<u> 64</u>.

I am Lyosha [343]3 years ago
6 0

use this formula Sn=n/2[2a+(n-1)d]

here,d=a2-a1 and n= no. Of terms

Step-by-step explanation:

S8=8/2[2(1)+(8-1)2]

S8=64

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