हिंदी

Find the sum of 12 terms of an A.P. whose nth term is given by an = 3n + 4. -

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प्रश्न

Find the sum of 12 terms of an A.P. whose nth term is given by an = 3n + 4.

विकल्प

  • 262

  • 272

  • 282

  • 292

MCQ

उत्तर

282

Explanation:-

Here an = 3n + 4

∴ a1 = 7, a2 - 10, a3 = 13

∴ a = 7, d = 10 - 7 = 3

∴ S12 = `12/2[2 xx 7 + (12 - 1) xx3]`

= 6[14 + 33]

= 6 × 47

= 282

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