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Instructions
In the following some of the combinations of operations and an operand
A: means ‘÷3’
B: means ‘x3’
C: means ‘-3’
D: means ‘+3’
E: means ‘÷2’
F: means ‘x2’
G: means ‘-2’
H: means ‘+2’
Solution
Expression : 42x21-12 ?=880
L.H.S. = 42x21-12 ? = 882 - 12 ?
(A) : A
= $$882 - 12 \div 3 = 882-4=878$$
(B) : F
= $$882-12 \times 2 = 882-24=858$$
(C) : G
= $$882-12 - 2 = 882-14=868$$
(D) : D
= $$882-12 +3 = 882-9=873$$
=> Ans - (E)
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