Question

the sum of the series 1+3+5+7+...up to 10 terms is

Answer 1

here
given series are in AP
I.e 1+3+5+7+...
d=2
a=1
n=10
s=n/2(2a+(n-1)d)
=10/2(2.1+(10-1)2
=5(20)
=100 ans

Answer 2

Hey there!!

This is problem of AP..

• 1+3+5+7........ Upto 10 terms

Here, a = 1, d = 2

Now use formula, Sn = n/2(2a +(n-1)d)

Here, n = 10 terms

Now,> Sn = 10/2 {2 + (10 - 1)×2}

>> = 5×20

>>>>>>> Sn = 100

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Hope it will help u