Question

find the 10th term from the end of an A.P 4,9,14,....,254.

Answer 1

Given
AP- 4,9,14........254
Last term of AP is 254
Since it is been asked to find the 10th term from end; a=254
d= -5 , n=10
an= a+(n-1)d
an = 254+ (10-1)(-5)
an= 254-45
an= 209

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Answer 2

hey dear

a1=4, a2=9,. an=254
d=9-4
=5

an=a+(n-1)d
254=4+(n-1)5
250=(n-1)5
250/5=n-1
50=n-1
50+1=n
51=n
10th term from last=51-10+1
=42
42 term=a+(n-1)d
a42=4+(42-1)5
=4+(41)5
=4+205
=209
10th term from last of Ap is 209
OK now