Question

in an ap if a=28,d=4,find a7
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Answer 1

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In an AP if a=28,d=4,find a7

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a=28;d=4

$a7 = a + 6d$

$a7 = 28 + 6 \times 4$

$a7 = 28 + 24 = 52$

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Answer 2

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Given:-

1st term of an Ap (a1) = 28

Commnon Difference(d) = 4

To Find:-

The 7th term of the ap

Solution:-

a7 = a + ( n-1 ) d

a7 = 28 + ( 7 -1 ) 4

a7 = 28 + 6 ×4

a7 = 28 + 24

a7 = 52

$\therefore{a7 = 52}$

★Note:-

The number of term of an ap is denoted by "n".

To Find the n term of an ap ,

an = a + ( n-1 ) d

[where , a = first term , d = common difference]

To find the sum of terms of an Ap ,

Sn = n/2 [ 2a + (n -1 )d]