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Sequences and Series — MATHS STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceMATHSSequences and Series1 Mark
MCQ
$\sum\limits^{4}_{\text{i = 1}}2\text{n}+3=\text{________}$
  • A
    5
  • B
    12
  • C
    21
  • D
    32
✓

Answer

  1. 32

Solution:

a1 = 2 × 1 + 3 = 5, a2 = 2 × 2 + 3 = 7, a3 = 2 × 3 + 3 = 9, a4 = 2 × 4 + 3 = 11.

Sum = 5 + 7 + 9 + 11 = 32.

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