Question

in progression if tn = n²(n+1)÷2n+1 then 3rd term is​

Answer 1

Answer:

t3=55

or

3rd term is 55

Step-by-step explanation:

3rd term

therefore,n=3

tn = n²(n+1)÷2n+1

t3=3²(3+1)÷2×3+1

t3=9×4÷2×3+1

t3=9×2×3+1

t3=54+1

t3=55

Answer 2

Answer:

36/7

Step-by-step explanation:

if n=3

(3)^2(3+1)÷2×3+1

9(4)÷6+1

36÷7

36/7