find the sum of the following number without actually adding the number (a) 1+3+5+7+9+11+13+15.
OS13:
count the numbers and square it
there is 8 numbers so answer is 8^2=64ans
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ANSWER:
The numbers are
1,3,5,7,9,11,13,15
They are in arithmetic progression
Here,
a=1
d=a2-a1=3-2=1
n=8
Sn=n/2{2a+(n-1)d}
S8=8/2{2(1)+(8-1)2}
=4{2+7(2)}
=4{16}
=64
Sum of terms =64
""”""""""""""""""""""""
Hope it helps you.
The numbers are
1,3,5,7,9,11,13,15
They are in arithmetic progression
Here,
a=1
d=a2-a1=3-2=1
n=8
Sn=n/2{2a+(n-1)d}
S8=8/2{2(1)+(8-1)2}
=4{2+7(2)}
=4{16}
=64
Sum of terms =64
""”""""""""""""""""""""
Hope it helps you.
yes it help very much
ok
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