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Grade: Upto college level
        1+5+13+25+.........
7 years ago

Answers : (2)

Shankararama Sharma
35 Points
							

The answer of sum upto n terms is,

(2n+1)(n+1)+ 3n(n+1) + 3n

7 years ago
Fawz Naim
37 Points
							

Let

Sn= 1+5+13+25+........T(n-1)+Tn

Sn=     1+5+13+25.................T(n-1)+Tn

__________________________________________

now subtracting the two equations

0=1+4+8+12+.......upto n terms -Tn

Tn=1+(4+8+12+.......upto (n-1)terms)

Tn=1+((n-1)/2[8+(n-2)4]

solve it to get the nth term

and to solve it use summation method 

7 years ago
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