Question

solve 1.3/5+2/7
answer me please
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Answer 1

Step-by-step explanation:

1/1*3 + 2/1*3*5 + 3/1*3*5*7 +...... n/1*2*...(2n+1

Rewrite

1/1*3 = 1/2 (1/1 - 1/3)

2/1*3*5 =1/2 (1/1*3 - 1/1*3*5)

Total is 1/3 + 2/15 =7/15

Lets check

1/2 ( 1/1 - 1/3 + 1/3 - 1/15)

= 1/2 (1 - 1/15)

= 1/2 (14/15)

= 7/15

It works

So sum is

1/2 [ 1 - 1/1*3*...*(2n+1)]

Take any value of N , put it here and get the sum

Answer 2

1.3/5 + 2/5

= 0.54571428