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Doctors Medicines MCQs Q&A

  1. Only A
  2. Only A and B
  3. Only A and C
  4. Only B and C
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1 Answers

Option 1 : Only A

Formula:

Sum of first whole numbers = n (n – 1)/2

Sum of square of first n even numbers = (1/6) × n × (n + 1) × (2n + 1)

Calculation:

Sum of first 21 whole numbers = (21 × 20)/2 = 210

Statement A is correct.

Sum of first 99 whole numbers = (99 × 98)/2 = 4851

Statement B is wrong.

Sum of first 10 even numbers = n/2 × (a + Tn)

⇒ 10/2 × (2 + 20) = 5 × 22 = 110.

Statement C is wrong

∴ Only Statement A is true
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