If the sum of the first 5 term of an AP is 75 and the first term is 5, the common difference is _____?
- 5
- 6
- 7
- None of these
Explanation
S5 = n/2 [2a + (n-1)d]
75 = 5/2 [2(5) + (5-1)d]
75 = 5/2 [10 + 4d]
30 = 10 + 4d
4d = 20
d = 5
Last verified on 09-02-2026
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