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4 cards from this section. Quick, good the night before a test.
What is the common difference in the A.P. 3, 6, 9, 12?
Subtract any two consecutive terms.
Find the 5th term of A.P. 1, 4, 7.
Use the nth term formula.
What is the common difference in the A.P. 4, 8, 12, 16?
Subtract the first term from the second.
The formula for the sum of the first n terms is S_n = ...
Think about average times the number of terms.
An A.P. starts at 10 and continues with a common difference of 4. What is the sum of the first 20 terms?
Remember to calculate the n-th term first for accurate summation.
If the 5th term of an A.P. is 25 and the 10th term is 50, find the common difference.
Set up equations for both terms and eliminate 'a' to solve for 'd'.
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