CBSE Class 10 Maths (Basic) 2025 · Paper 430/3/1 · Question 26(b)

Real Numbers 3 marks Medium

Find which among the following numbers

a

b

and

c

is/are composite numbers:

a = 7 \times 11 \times 13 + 13

;

b = 6 \times 5 \times 4 + 4

;

c = 7 \times 13 + 6

Answer

a = 1014 = 2 \times 3 \times 1 3^{2}

and

b = 124 = 2^{2} \times 31

are composite numbers;

c = 97

is a prime number, so it is not composite.

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