What does it mean by the first term of each is unity in ARITHMETIC PROGRESSIONS?
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Given, a = 1, d = 4. Option 1: T = 4551
a + (n-1)d = 4551
1 + (n-1)4 = 4551
n-1=4550/4 = not divisible by 4
Option 2: T = 10091
n-1 = 10090/4 = not divisible by 4
Option 3: T=7881
n-1 = 7880/4 = 1970
n = 1971 which is an integer. Therefore Option 3 is correct.
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