CUET UG 2025 — General Test Quantitative Reasoning

The product to find is $86 \times 87 \times 88 \times 89 \times 90 \times 91 \times 92 \times 93 \times 94$86×87×88×89×90×91×92×93×94

To find the unit's digit of a product, we only need to consider the unit's digits of each number being multiplied.

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The unit's digits of the consecutive numbers are:

86 → 6

87 → 7

88 → 8

89 → 9

90 → 0

91 → 1

92 → 2

93 → 3

94 → 4

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Since 90 is included in the sequence, and 90 has a unit's digit of 0, the entire product will end in 0.

When any number is multiplied by a number ending in 0, the result always ends in 0.

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Therefore, the unit's digit of the product $86 \times 87 \times 88 \times 89 \times 90 \times 91 \times 92 \times 93 \times 94$86×87×88×89×90×91×92×93×94 is $0$0.