Find `-2 1/9 xx 3/4`

2/5 xx ((-1)/9) + 23/180 - 1/9 xx 3/4 =_____

Simplify: : 1/2 xx 3/4 xx 8/9

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

Perform the following multiplication a) 2/9 xx 7/8 xx 1/9 b) 1/3 xx 4/5 xx 1/4 c) 1/3 xx 2/4 xx 5/3 d) 1/2 xx 1/3 xx 1/4 e) 1/5 xx 2/5 xx 2/3 f) 2/3 xx 5/6 xx 1/4

Simplify : [ ((- 3 )/( 2) xx (4)/(5) ) + ((9)/(5) xx (-10)/( 3)) - ((1)/(2)xx (3)/(4)) ] div [ ((21)/( 9) xx (3)/(7)) +((7)/(8) xx (16)/(14)) ]

Evaluate : 32.9 - 75.5 div 2.5 + 16.1 xx 0.3 + 4.5

Find 'n' if 9xx ^((n-1))P_3 = ^nP_4 .