Solution to Today's CSAT PYQ
Notice that every single number in this sequence is odd.
Also, notice the number 5 is sitting right there in the series.
Any odd number multiplied by 5 will always end in a 5.
Because there is absolutely no even number in this series to turn that 5 into a zero, the unit digit is mathematically guaranteed to be 5.
Option C is your answer.
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1August 26, 2026 3.1K 2