Question

प्र०4. यदि किसी A.P. में d = -4,n = 7 तथा an = 4 तो a -
(ग) 28
(क) 6
(ख) 20​

Answer 1

Answer:

28

Step-by-step explanation:

$d = - 4 \\ n = + 7 \\ an = 4 \\ \\ from \: \: equation \: \: of \: \: ap \\ \\ an = a + (n - 1)d \\ \\ 4 = a + (7 - 1)( - 4) \\ \\ 4 = a + 6( - 4) \\ \\ 4 = a - 24 \\ \\ a = 28$

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Answer 2

Step-by-step explanation:

an= a+(n-1)d

4= a+ (7-1)(-4)

4= a-24

4+24=a

a= 28