Show that : `(9 !) / (6 ! xx 3 !) + (9 !) / (5 ! xx 4 !) = (10 !) / (4 ! xx 6 !)`

Show that (1 kWh = 3.6 xx 10^6J ).

Multiply : (-9) xx (6)

Multiply : (9) xx (-4)

Show that kWh=3.6 times 10^5 J

Find S_n of the following arithmatical geometric sequence. 2 xx 1 , 4 xx 3 , 6 xx 9 , 8 xx 27 , 10 xx 81 …..

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

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