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The 7th term of an AP is 4 and its common difference is -4. What is its first term?

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The 7th term of an AP is 4 and its common difference is -4. What is its first term?
A. 16
B. 20
C. 24
D. 28
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Correct Answer - D
`a+6d = 4 rArr a +6 xx (-4) = 4 rArr a = 28.`
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