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7 × 29 × 23 + 1 is : (Class 10 Maths Basic 2026, Q17)

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MathsCBSE Class 10 · Basic · Board exam 2026, set 430/4/1 · 1 mark · MCQ

CBSE Class 10 Mathematics Basic 2026: question 17

Set in the CBSE Class 10 board exam of 2026, paper 430/4/1, section A, question 17, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q17 · 1 mark · MCQReal Numbers

is :

  1. (A)a prime number.
  2. (B)divisible by .
  3. (C)an odd number.
  4. (D)a composite number.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 430/4/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

Is the product of three odd numbers odd or even?

Hint 2

Adding 1 to an odd number gives what?

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. , which is odd, so is even.

  2. has factors other than 1 and itself, so it is composite, option (D).

    1 mark

Answer: a composite number, option (D)

Where the marks are

  • Shows that the number is even, hence composite (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Real Numbers, one at a time, marked against the answer key and marking points.Back to the full paper2026 board paper, set 430/4/1 (Basic): every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.