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Question

Select the solution set of 1<2x+310 from given options

A
{1,2,3}
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B
{1,2,3,4}
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C
{2,3,4}
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D
{2,3,4,5}
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Solution

The correct option is A {1,2,3}
1<2x+310
Subtract 3 from each sides
13<2x+33103
4<2x7
Divide by 2 each side
42<2x272
2<x3.5
From here we can say that x will that all the value between -2 to 3.5 [including 3.5 because sign].

Now lets look at options

A) {1,2,3}
B) {1,2,3,4} not possible because 4 is not in the range
C) {2,3,4} same reason
D) {2,3,4,5} Same reason

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