The correct option is B 6.42,2.88,2.4
Aligning the decimal point,
2.4
6.42
2.88
We start comparing the digits from left end.
2.4
6.42
2.88
Comparing the unit place digit we find that 6>2. Hence, 6.42 is the largest among the three numbers.
For 2.4 and 2.88, we move one place right.
2.4
2.88
Comparing the tenths place, we find that 8>4. Hence, 2.88 is larger than 2.4.
On arranging in descending order:
6.42, 2.88, 2.4