Multiple choice

For the series, 90, 93, 96, 99, _____, find the first two terms greater than 500.

  1. 503, 506

  2. 507, 510

  3. 501, 504

  4. 502, 505
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The series is an arithmetic progression with a = 90 and d = 3. The n-th term is 90 + (n-1)3 > 500. 3(n-1) > 410. n-1 > 136.66, so n > 137.66. The 138th term is 90 + 137*3 = 90 + 411 = 501. The next term is 504.

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