Find the value
`3a xx 4b xx 7c = ?`

Find the value of |-7| xx|3|

find the value (6/7 xx 3/4) + (6/7 xx 11/4)

Find the value of |7| xx |-4|xx |4-9|

Find the value : 3! xx (7!)/(5!)

Find the value of: (7 xx 6 + 5 - 15) :- 4 + 6 :- 3 - 4 + 18 :- 3

Find the value of ( a - b ) times ( a + b ) + ( b -c ) times ( b + c ) + ( c + a ) times ( c - a ) = A) -1 B) 0 C) 1

Find the value of ( 1 5/9 ) times ( -3 3/8 ) ÷ ( - 7 times 3/4 ) is ( a ) 1/2 ( b ) -1/2 ( c ) 1 ( d ) -1