Question

Which two numbers should be interchanged to make the given equation correct? 21 × 4 + (84 ÷ 7) × 2 – 15 × 5 + 42 = 105 (Note: Interchange should be done of entire number and not individual digits of a given number.)

A 4 and 2
B 84 and 42
C 4 and 5
D 7 and 21
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