Math, asked by kkthrilochanreddy, 5 months ago

if the 10th term of AP is 15 and 15 term is 10 then the fourth term is​

Answers

Answered by saiyedfazil
5

a10 =15

a+9d =15 -1

a15=10

a+14d =10 -2

subtractingeq1and2

a+9d=15

a+14d=10

we get -5d =5

d =-1

a+9d = 15

a+9×-1=15

a +(-9)=15

a=15+9=24

a4 = a+3d

= 24+3×-1

=24+(-3)

=21

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Answered by sahilgadge24
1

15 th term = a+14d=10-----1

10 term =a+9d=15---------2

subtracting equation 1 and 2

d=-5

substituting d in equation 1

a+9×(-5)=10

a-45=10

a=55

we know that a is 55 and d is -5

so fourth term will be

4 th term = a+3d

55+3×(-5)

55-15

40

their fore fourth term is 40

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