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T19 = ? for the given A.P., 9, 4, −1, −6 ........ Activity :- Here a = 9, d = □ tn = a + (n − 1)d t19 = 9 + (19 − 1) □ = 9 + □ = □ - Algebra

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Sum

t19 = ? for the given A.P., 9, 4, −1, −6 ........

Activity :- Here a = 9, d = `square`

tn = a + (n − 1)d

t19 = 9 + (19 − 1) `square`

= 9 + `square`

= `square`

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Solution

Here a = 9, d = 4 - 9 = − 5

tn = a + (n − 1)d

t19 = 9 + (19 − 1) − 5

= 9 + 18(-5)

= 9 + − 90

= − 81 

Concept: Arithmetic Progression
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