In an AP if the common difference (d) = - 4, and the seventh term (a7

1.	In an AP if the common difference (d) = - 4, and the seventh term (a7) is 4, then find the first term.
Answer» Given d = -4 and a₇= 4 We know that n^th terrn of A.P is a_{n =}a+(n-1) d a₇ = a + (7 -1)d [ n = 7 ] 4 = a + 6 (-4) .'. a = 4 + 24 = 28 .'. First term of an A.P = 28

In an AP if the common difference (d) = - 4, and the seventh term (a7) is 4, then find the first term.

Answer»

Given d = -4 and a₇= 4

We know that n^th terrn of A.P is

a_{n =}a+(n-1) d

a₇ = a + (7 -1)d [ n = 7 ]

4 = a + 6 (-4)

.'. a = 4 + 24 = 28

.'. First term of an A.P = 28

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In an AP if the common difference (d) = - 4, and the seventh term (a7) is 4, then find the first term.

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