निम्नलिखित संख्या श्रृंखला में प्रश्नवाचक चिह्न $(?)$ के स्थान पर क्या आएगा?
$1, 3, 6, 10, 15, ?$

  • A
    $17$
  • B
    $18$
  • C
    $20$
  • D
    $21$

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दी गई श्रृंखला में से विषम संख्या ज्ञात कीजिए: $1, 5, 11, 19, 29, 55$.

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