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Q.

The 7th term of an AP is 4 and its common difference is -4. Then the first term of an A.P. is [[1]].


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answer is 28.

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Detailed Solution

The 7th term of an AP is 4 and its common difference is -4. Then the first term of an A.P. is 28.
Given that the 7th term of an A.P. is 4 and the common difference is 04.
Formula used for nth term of A.P.:
a n =a+ n−1 d
Let the first term be a.
a 7 =a+(7−1)d ⇒a+6 −4 =4 ⇒a−24=4 ⇒a=24+4 ⇒a=28
Therefore, the first term of an A.P. is 28.
 
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