Question

in an a.p d=10 then t20-t15=?​

Answer 1

Answer:

Given: d=3

We know:

a

n

=a+(n−1)d

∴a

20

−a

15

=[a+19d]−[a+14d]

=5d

=5×3

=15

Hence, the answer is 15.

Step-by-step explanation:

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