The 7th term and 14th term of an AP are -9 and -23 respectively. Determine 1st term and common difference
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Let a be first term and common difference be d
a(7th term) + 7d = a(14th term)
-9+ 7d = -23
7d = -14
d= -2
a+ (7-1)d= -9
a + 6(-2) = -9
a -12 = -9
a = 3
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