Question

18. Find the 20th term from the last term of the A.P. 3, 8, 13, ...., 253

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Answer 1

Answer:

a=3,d=5

253=3+5(n−1)

Or, 5(n−1)=250

Or, n−1=50

Or, n=51

So, the 20th term from the last term =51−19=32nd term

Now, n

32

=3+5×31=158

Step-by-step explanation:

meri as brainlest

Answer 2

Answer:

158 is 20 th term from 253

Step-by-step explanation:

a1=3

a2=8

a3=13

l=253

a+d=8

3+d=8

d=5

253=a+(n-1)×d

253=3+(n-1)×5

253-3/5=(n-1)

250/5=(n-1)

51=n

now 51-19=32 ( last term -19=original term no.)

a32=a+31d

=3+31×5

=3+155

=158