Exams › SSC CGL (Prelims) › General

What is the average of all integers between 200 and 350 that are exactly divisible by 11?

1. 275
2. 272
3. 286
4. 292

Correct answer: 275

Solution

The integers divisible by 11 between 200 and 350 are an arithmetic progression. The first such multiple is 209 and the last is 341. The average of an AP is the mean of the first and last terms, so the answer is (209+341)/2 = 275.

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