Ex 1.1, 6 - Chapter 1 Class 10 Real Numbers
Last updated at April 16, 2024 by Teachoo
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Ex 1.1
Ex 1.1, 1 (i)
Ex 1.1, 1 (ii)
Ex 1.1, 1 (iii) Important
Ex 1.1, 1 (iv) Important
Ex 1.1, 1 (v)
Ex 1.1, 2 (i)
Ex 1.1, 2 (ii) Important
Ex 1.1, 2 (iii)
Ex 1.1, 3 (i)
Ex 1.1, 3 (ii)
Ex 1.1, 3 (iii) Important
Ex 1.1, 4 Important
Ex 1.1, 5
Ex 1.1, 6 You are here
Ex 1.1, 7 Important
Ex 1.2 →
Chapter 1 Class 10 Real Numbers
Serial order wise
-
Ex 1.1
- Ex 1.2
- Examples
- Case Based Questions (MCQ)
- MCQs from NCERT Exemplar
- Past Year MCQ (Maths Standard)
- Euclid's Division Algorithm
- Decimal Expansion
Transcript
Ex 1.1, 6 Explain why 7 × 11 × 13 + 13 and 7 × 6 × 5 × 4 × 3 × 2 × 1 + 5 are composite numbers. Checking 7 × 11 × 13 + 13 7 × 11 × 13 + 13 = 13 × ( 7 × 11 + 1) = 13 × (77 + 1) = 13 × 78 = 13 × 13 × 3 × 2 Since it has more than two factors (13, 3, 2, 1, 13 × 78), ∴ It is a composite number Checking 7 × 6 × 5 × 4 × 3 × 2 × 1 + 5 Now, 7 × 6 × 5 × 4 × 3 × 2 × 1 + 5 = 5 × (7 × 6 × 4 × 3 × 2 × 1 + 1) = 5 × (1008 + 1) = 5 × 1009 Since it has more than two factors (5, 1009, 1 , 5 × 1009), ∴ It is a composite number
