Q. 15 O5.0( 1 Vote )

If for A.P., T<su

Answer :

We know that, Tn = a + (n – 1)d

So we have, T25= a + (25 – 1)d

T25= a + 24d

Now we have, T20= a + (20 – 1)d

T20= a + 19d

It is given that, T25 — T20 = 15

So we can say that,

15 = [a + 24d] – [a + 19d]

15 = 5d

d = 3

the correct option is (a).

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