Find `1 xx 5 + 3 xx 7 + 5 xx 9 + 7 xx 11` .... upto n terms.

Find 2 xx 5 xx 8 + 4 xx 7 xx 10 + 6 xx 9 xx 12 ……. Upto n terms.

Find the sum 5 xx 7 + 9 xx 11 + 11 xx 3 + ... upto n terms.

Find 2 xx 6 + 4 xx 9 + 6 xx 12 + …… upto n terms.

If (1 xx 2 + 2 xx 3 + 3 xx 4 + 4 xx 5+ … upto n terms) / (1 + 2 + 3 + 4 + ………………….. upto n terms) = 100 / 3 , find n

Find the sum 5 xx 7 +7xx9+ 9 xx 11 +11xx13+ 13 xx 15 + ……. upto n terms.

Find the sum 1 xx 3 xx 5 + 3 xx 5 xx 7 + 5 xx 7 xx 9 + ……. + (2n - 1) ( 2n + 1) ( 2n + 3)