Lessons

General Aptitude
9.1 Numbers - General Questions

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Q.

The sum of all two digit numbers divisible by 5 is:

View Answer

Correct choice: D

Explanation:

Required numbers are 10, 15, 20, 25, ..., 95

This is an A.P. in which a = 10, d = 5 and l = 95.

tn = 95    ⇒    a + (n - 1)d = 95

⇒ 10 + (n - 1) x 5 = 95

⇒ (n - 1) x 5 = 85

⇒ (n - 1) = 17

n = 18

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