Question

Find the
sum
of all 2 digit
odd positive numbess
suna el​

Answer 1

Answer:

The 2 digit odd positive numbers are 1,3,5......97,99

This becomes an AP with a=1, d=2 and an=99

an= a+(n-1)d

99=1+(n-1)2

98/2 = n-1

n=49+1=50

Therefore Sn = n/2(a+an) = 50/2(1+99)= 25×100=2500

Therefore the sum of odd positive numbers is 2500.

Please mark as brainliest answer.

Answer 2

Answer:

The spinal cord is a thin,long,tubular structure made up of nervous tissue ,which extend from the medulla oblongata in the brainstem to the lumbar region of the vertebral column.It encloses the central canal in the spinal cord ,which contains cerebrospinal fluid .

hope this helps you

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