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General Form of an AP

For the A.P. ...

Question

For the A.P. if $a = 7$ and $d = 2.5,$ then $t_{12} = ?$

37.5

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34.5

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28.2

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44.5

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Solution

The correct option is B 34.5
It is known that in an AP, $t_{n} = a + (n - 1) d$
Put the value of $n$ as $12$ .
$t_{12} = 7 + (12 - 1) (2.5)$
$= 7 + 11 \times 2.5$
$34.5$

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Similar questions

a = - 7

d = 5

T_{12}

T_{7} = 12

T_{12} = 72,

d =

a = - 18.9, d = 2.5, a_{n} = 3.6,

n

A . P . (a; d)

a

d > 0

A . P (1; 3) \cap A . P (2; 5) \cap A . P . (3; 7) = A . P (a; d)

a + d

A . P .,

a = 11

d = 1.5,

t_{3} = ?

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