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Mathematics : Real Numbers

Short Answer Type

61. Is 7 × 11 × 13 + 11 a composite number.

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62. Explain why 7 × 11 × 13 + 13 and 7 × 6 × 5 4 × 3 × 2 × 1 + 5 are composite numbers.

120 Views

63.

Use Euclid’s division to find HCF of:

(i) 196 and 38220 (ii) 392 and 267540 (iii) 455 and 42

(iv) 81 and 237 (v) 867 and 255.

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64.

State whether $space space space space fraction numerator 231 over denominator 2 squared cross times 5 squared cross times 7 end fraction$ has terminating or non terminating repeating decimal expansion.

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65. State whether

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has a terminating or non-terminating decimal expansion.

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66. Given that HCF (24000) = 4. Write LCM (24, 100).

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67. If a and b are two prime numbers, what will be the IICF of these two numbers.

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68. Given that LCM (26, 169) = 338, write HCF (26, 169).

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69. Express

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as a non-terminating recurring decimal.

110 Views

70. If

straight x equals straight P over straight q

be a rational number, such that the prime factorisation of q is of the form 2ⁿ5^m, where n, m are non-negative integers. Then x has a decimal expansion which terminates. Is this statement true ?

170 Views