Quantitative Reasoning

Number System

Easy

Determine the unit's digit in the product of consecutive numbers from 86 to 94?

✅ Correct Option: 4

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

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

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

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.

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

2025: 20 May Shift 1

Which one of the following statement(s) is/are correct?

(A) Every whole number is a natural number.

(B) Every natural number is a whole number.

(D) Every rational number is a whole number

Choose the correct answer from the options given below:

2022: 20 Aug Shift 1

What is the smallest number of five digits formed by using the digits 2, 4, 0, 3, 5 ?

2026: 24 May Shift 1

Which of the following statements is/are correct about irrational numbers?

(A) The sum of two rational numbers is always irrational.

(B) $\pi$ is an irrational number.

(D) The value of $\sqrt{5}$ is an irrational number.

Choose the correct answer from the options given below:

2022: 6 Aug Shift 1

Given set is (2, 17, 31) is set of:

(a) Prime numbers

(b) Whole numbers

(d) Even numbers

Choose the correct answer from the options given below:

2025: 22 May Shift 2

Match List-I with List-II

List-I	List-II
(A) The least number that must be subtracted from 2025 to get a number exactly divisible by 17	(I) 5
(B) The least number that must be added to $1057^5$ to get a number exactly divisible by 23.	(II) 2
(C) Unit digit of $6^{15} - 7^4$	(III) 0
(D) The product of any number and the 1st whole number is:	(IV) 1

Choose the correct answer from the options given below:

2026: 31 May Shift 1

Match the LIST-I with LIST-II

LIST-I (Number)	LIST-II (Unit digit of the number)
A. $4^{425}$	I. 6
B. $4^{1024}$	II. 4
C. $133^{63} \times 4^{49}$	III. 3
D. $3^{81}$	IV. 8

Choose the correct answer from the options given below:

Determine the unit's digit in the product of consecutive numbers from 86 to 94?

Solution

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