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WAEC - Mathematics (1997 - No. 27)

The eleventh term of an AP, is 25 and its first term is -3. Find its common difference.
19/10
21/5
23/11
21/2
24/5

Vysvětlení

a + 10d = 25
-3 + 10d = 25
d = 28/10 = 24/5

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