Hazeeq Abdullah's answer to Janice's Form4 Malaysia question.
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recall that formula for the nth term is ar^(n-1) for a GP where is 1st term and r is the common ratio.
for 2, you can make use of this equation to solve the no. of terms. for 2a, 8/243 would be the nth term. sub in the a and r and you can solve for n.
for 2c, I gave another method. since the powers of the terms are increasing by 3 each time, the powers of the terms would follow an arithmetic progression of common difference 3. you can then use this to find the number of terms.
for 2, you can make use of this equation to solve the no. of terms. for 2a, 8/243 would be the nth term. sub in the a and r and you can solve for n.
for 2c, I gave another method. since the powers of the terms are increasing by 3 each time, the powers of the terms would follow an arithmetic progression of common difference 3. you can then use this to find the number of terms.
Date Posted:
5 years ago
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