2. If the common difference of an A.P. is 3, then find a20-a15
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Answered by
1
Answer:
99
Step-by-step explanation:
a+(n-1)d is the formula
So,a+(20-1)3-a+(15-1)3
=a+19×3-a+14×3
=a+57-a+42
=57+42
=99
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