Class X

Every positive odd integer is of the form ________ where ‘q’ is some integer.
  1. 2q + 1
  2. 2q – 1
  3. 2q
  4. None of these
The least number nn so that 5n5n is divisible by 3, where nn is:
  1. no natural number
  2. a real number
  3. a natural number
  4. a whole number
If p, q are two prime numbers, then LCM(p, q) is :
  1. p
  2. q
  3. pq
  4. 1
If HCF if 60 and 168 is 12, what is the LCM
  1. 480
  2. 240
  3. 840
  4. 340
If p, q are two consecutive natural numbers, then HCF(p, q) is:
  1. q
  2. p
  3. 1
  4. qp
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