Question

If in an AP, an = 3 + 3n, find a20 – a15​

Answer 1

Answer:

15

Step-by-step explanation:

a20= 3+ 3*20=63

a15=3+ 3*15=48

a20-a15= 63-48 = 15

Answer 2

Answer:

a20-a15 = 15

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