Which of the following is NOT equal to $$1\frac 34$$​?

Correct option is D

Given
Mixed fraction = $$1\frac{3}{4}$$​​

Formula Used
Mixed to improper fraction conversion: $$a\frac{b}{c} = \frac{a × c + b}{c}$$​​
Fraction to decimal conversion.

Solution
Convert $$1\frac{3}{4}$$​ into an improper fraction:

​$$1\frac{3}{4} = \frac{1 × 4 + 3}{4} = \frac{7}{4}$$​​

Convert  $$\frac{7}{4}$$​ to an equivalent fraction by multiplying the numerator and denominator by 2:
​$$\frac{7 × 2}{4 × 2} = \frac{14}{8}$$​​
Convert $$\frac{7}{4}$$​ to a decimal:
​$$\frac{7}{4} = 1.75$$​​
Comparing with the given options, 1.7 is NOT equal to $$1\frac{3}{4}.$$​​
So the correct answer is (d)