Question

In an A.P. first term is a and seventh term is 31, if common difference is ½, find a.​

Answer 1

Answer:

a is 28

Step-by-step explanation:

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Answer 2

Answer:

First term (a) = 28

Explanation:

Given in an A.P

common difference (d)=-4---(1)

Let first term = a

/* we know that ,

\boxed { n^{th}\: term = (a_{n}) = a+(n-1)d}

n

th

term=(a

n

)=a+(n−1)d

*/

Now,

a_{7} = 4a

7

=4

/* given */

=> a + 6d = 4

=> a + 6(-4) = 4 [ from (1)]

=> a - 24 = 4

=> a = 28

Therefore,

First term (a) = 28