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9th term of an AP is-32 …

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9th term of an AP is-32 and the sum of its 11th and 13th term is-94 .find the AP

Posted by Vaishnavi Bhangale 6 years, 10 months ago

CBSE > Class 10 > Mathematics

5 answers

Rohan Yadav 6 years, 10 months ago

Sorry I didn't saw the negative sign that's why my ap is wrong

Rajneesh Kaurav 6 years, 10 months ago

A=-7. D=-15/8

Rohan Yadav 6 years, 10 months ago

AP:-8,-3,2,7....

Ram Kushwah 6 years, 10 months ago

T9=a+8d=-32

a=-32-8d-----------(1)

T11+T13=a+10d+a+12d=-94

2a+22d=-94

a+11d=-47

-32-8d+11d=-47

3d=-15

d=-5

now from (1)

a=-32+11(-5)

=-32-8(-5
=-32+40=8

so AP is

8,3,-2,-7,-12,-17........

Gaurav Seth 6 years, 10 months ago

Let a be the first term and d be the common difference of the AP. Then,

Hence, the common difference of the AP is -5.

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